diff --git a/docs/changes/latest.inc b/docs/changes/latest.inc
index 234590313..ab910e434 100644
--- a/docs/changes/latest.inc
+++ b/docs/changes/latest.inc
@@ -83,6 +83,8 @@ Enhancements
 
 - Rename "atlas" to "parcellation" (:gh:`116` by `Fede Raimondo`_).
 
+- Refactor the :class:`junifer.datagrabber.BaseDataGrabber` class to allow for easier subclassing (:gh:`123` by `Fede Raimondo`_).
+
 Bugs
 ~~~~
 
@@ -91,6 +93,8 @@ Bugs
 
 - Fix a bug in which AOMIC PIOP2 datagrabber did not use user input to constrain elements based on tasks (:gh:`105` by `Leonard Sasse`_)
 
+- Fix a bug in which a datalad dataset could remove a user-cloned dataset (:gh:`53` by `Fede Raimondo`_)
+
 API changes
 ~~~~~~~~~~~
 
diff --git a/junifer/datagrabber/aomic/id1000.py b/junifer/datagrabber/aomic/id1000.py
index 250a78594..2266ff04b 100644
--- a/junifer/datagrabber/aomic/id1000.py
+++ b/junifer/datagrabber/aomic/id1000.py
@@ -24,15 +24,11 @@ class DataladAOMICID1000(PatternDataladDataGrabber):
         The directory where the datalad dataset will be cloned. If None,
         the datalad dataset will be cloned into a temporary directory
         (default None).
-    **kwargs
-        Keyword arguments passed to superclass.
-
     """
 
     def __init__(
         self,
         datadir: Union[str, Path, None] = None,
-        **kwargs,
     ) -> None:
         # The types of data
         types = [
diff --git a/junifer/datagrabber/aomic/piop1.py b/junifer/datagrabber/aomic/piop1.py
index d633ef3b4..0e65acee8 100644
--- a/junifer/datagrabber/aomic/piop1.py
+++ b/junifer/datagrabber/aomic/piop1.py
@@ -8,7 +8,7 @@
 
 from itertools import product
 from pathlib import Path
-from typing import Dict, List, Tuple, Union
+from typing import Dict, List, Union
 
 from junifer.datagrabber import PatternDataladDataGrabber
 
@@ -30,16 +30,12 @@ class DataladAOMICPIOP1(PatternDataladDataGrabber):
             "gstroop", "workingmemory"} or list of the options, optional
         AOMIC PIOP1 task sessions. If None, all available task sessions are
         selected (default None).
-    **kwargs
-        Keyword arguments passed to superclass.
-
     """
 
     def __init__(
         self,
         datadir: Union[str, Path, None] = None,
         tasks: Union[str, List[str], None] = None,
-        **kwargs,
     ) -> None:
         # The types of data
         types = [
@@ -122,25 +118,24 @@ class DataladAOMICPIOP1(PatternDataladDataGrabber):
             replacements=replacements,
         )
 
-    def __getitem__(self, element: Tuple[str, str]) -> Dict[str, Path]:
+    def get_item(self, subject: str, task: str) -> Dict[str, Path]:
         """Index one element in the dataset.
 
         Parameters
         ----------
-        element : tuple of str
-            The element to be indexed. First element in the tuple is the
-            subject, second element is the task.
+        subject : str
+            The subject ID.
+        task : {"restingstate", "anticipation", "emomatching", "faces", \
+                "gstroop", "workingmemory"}
+            The task to get.
 
         Returns
         -------
         out : dict
             Dictionary of paths for each type of data required for the
             specified element.
-
         """
-        sub, task = element
 
-        # depending on task 'acquisition is different'
         task_acqs = {
             "anticipation": "seq",
             "emomatching": "seq",
@@ -152,8 +147,7 @@ class DataladAOMICPIOP1(PatternDataladDataGrabber):
         acq = task_acqs[task]
         new_task = f"{task}_acq-{acq}"
 
-        out = super().__getitem__((sub, new_task))
-        out["meta"]["element"] = {"subject": sub, "task": task}
+        out = super().get_item(subject=subject, task=new_task)
         return out
 
     def get_elements(self) -> List:
diff --git a/junifer/datagrabber/aomic/piop2.py b/junifer/datagrabber/aomic/piop2.py
index a13354227..9d39eb024 100644
--- a/junifer/datagrabber/aomic/piop2.py
+++ b/junifer/datagrabber/aomic/piop2.py
@@ -29,16 +29,12 @@ class DataladAOMICPIOP2(PatternDataladDataGrabber):
             or list of the options, optional
         AOMIC PIOP2 task sessions. If None, all available task sessions are
         selected (default None).
-    **kwargs
-        Keyword arguments passed to superclass.
-
     """
 
     def __init__(
         self,
         datadir: Union[str, Path, None] = None,
         tasks: Union[str, List[str], None] = None,
-        **kwargs,
     ) -> None:
         # The types of data
         types = [
diff --git a/junifer/datagrabber/base.py b/junifer/datagrabber/base.py
index ef5cc3ec7..3fcbad91c 100644
--- a/junifer/datagrabber/base.py
+++ b/junifer/datagrabber/base.py
@@ -63,10 +63,7 @@ class BaseDataGrabber(ABC):
         Parameters
         ----------
         element : str or tuple
-            The element to be indexed. If one string is provided, it is
-            assumed to be a tuple with only one item. If a tuple is provided,
-            each item in the tuple is the value for the replacement string
-            specified in "replacements".
+            The element to be indexed.
 
         Returns
         -------
@@ -76,8 +73,14 @@ class BaseDataGrabber(ABC):
 
         """
         logger.info(f"Getting element {element}")
-        out = {}
-        out["meta"] = {"datagrabber": self.get_meta()}
+        if not isinstance(element, tuple):
+            element = (element,)
+        named_element = dict(zip(self.get_element_keys(), element))
+        out = self.get_item(**named_element)
+        out["meta"] = {
+            "datagrabber": self.get_meta(),
+            "element": named_element
+        }
         return out
 
     def __enter__(self) -> "BaseDataGrabber":
@@ -115,18 +118,6 @@ class BaseDataGrabber(ABC):
                 t_meta[k] = v
         return t_meta
 
-    # TODO: what is the final functionality?
-    def get_element_keys(self) -> str:
-        """Get element keys.
-
-        Returns
-        -------
-        str
-            The element keys.
-
-        """
-        return "element"
-
     @property
     def datadir(self) -> Path:
         """Get data directory path.
@@ -139,6 +130,24 @@ class BaseDataGrabber(ABC):
         """
         return self._datadir
 
+    @abstractmethod
+    def get_element_keys(self) -> str:
+        """Get element keys.
+
+        For each item in the ``element`` tuple passed to ``__getitem__()``,
+        this method returns the corresponding key(s).
+
+        Returns
+        -------
+        str
+            The element keys.
+
+        """
+        raise_error(
+            msg="Concrete classes need to implement get_element_keys().",
+            klass=NotImplementedError,
+        )
+
     @abstractmethod
     def get_elements(self) -> List:
         """Get elements.
@@ -155,3 +164,24 @@ class BaseDataGrabber(ABC):
             msg="Concrete classes need to implement get_elements().",
             klass=NotImplementedError,
         )
+
+    @abstractmethod
+    def get_item(self, **element: Dict) -> Dict[str, Dict]:
+        """Get the specified item from the dataset.
+
+        Parameters
+        ----------
+        element : dict
+            The element to be indexed.
+
+        Returns
+        -------
+        dict
+            Dictionary of paths for each type of data required for the
+            specified element.
+
+        """
+        raise_error(
+            msg="Concrete classes need to implement get_item().",
+            klass=NotImplementedError,
+        )
diff --git a/junifer/datagrabber/datalad_base.py b/junifer/datagrabber/datalad_base.py
index 2377736ba..1e5fa924e 100644
--- a/junifer/datagrabber/datalad_base.py
+++ b/junifer/datagrabber/datalad_base.py
@@ -10,11 +10,12 @@ from pathlib import Path
 from typing import Dict, Optional, Tuple, Union
 
 import datalad.api as dl
+from datalad.support.gitrepo import GitRepo
 
 from ..api.decorators import register_datagrabber
 from ..utils import logger
 from .base import BaseDataGrabber
-from .utils import raise_error
+from ..utils import raise_error, warn_with_log
 
 
 @register_datagrabber
@@ -81,12 +82,37 @@ class DataladDataGrabber(BaseDataGrabber):
         logger.debug(f"\t_rootdir = {rootdir}")
         self.uri = uri
         self._rootdir = rootdir
+        # Flag to indicate if the dataset was cloned before and it might be
+        # dirty
+        self._dataset_dirty = False
 
     @property
     def datadir(self) -> Path:
         """Get data directory path."""
         return super().datadir / self._rootdir
 
+    def _get_dataset_id_remote(self) -> str:
+        """Get the dataset id from the remote.
+
+        Returns
+        -------
+        str
+            The dataset id.
+
+        """
+        remote_id = None
+        with tempfile.TemporaryDirectory() as tmpdir:
+            logger.debug(f"Querying {self.uri} for dataset ID")
+            repo = GitRepo.clone(
+                self.uri, path=tmpdir,
+                clone_options=["-n", "--depth=1"])
+            repo.checkout(name=".datalad/config", options=["HEAD"])
+            remote_id = repo.config.get("datalad.dataset.id", None)
+            logger.debug(f"Got remote dataset ID = {remote_id}")
+        if remote_id is None:
+            raise_error("Could not get dataset ID from remote")
+        return remote_id
+
     def _dataset_get(self, out: Dict) -> Dict:
         """Get the dataset found from the path in `out`.
 
@@ -98,39 +124,90 @@ class DataladDataGrabber(BaseDataGrabber):
         Returns
         -------
         dict
-            The modified dictionary with version appended.
+            The modified dictionary with meta updated.
 
         """
-        for _, v in out.items():
-            if "path" in v:
-                logger.debug(f"Getting {v['path']}")
-                # Note, that `self._dataset.get` without an option would get
-                # the content of all files in a (sub-dataset) if `v["path"]`
-                # was to point to a subdataset rather than a file. This may be
-                # a source of confusion (+ performance/storage issue) when
-                # implementing a grabber.
-                self._dataset.get(v["path"])
-                logger.debug("Get done")
+        to_get = [v["path"] for v in out.values() if "path" in v]
+
+        if len(to_get) > 0:
+            logger.debug(f"Getting {len(to_get)} files using datalad:")
+            for fname in to_get:
+                logger.debug(f"\t: {fname}")
+
+            dl_out = self._dataset.get(to_get, result_renderer="disabled")
+            if not self._was_cloned:
+                # If the dataset was already installed, check that the
+                # file was actually downloaded to avoid removing a
+                # file that was already there.
+                for t_out in dl_out:
+                    t_path = Path(t_out["path"])
+                    if t_out["status"] == "ok":
+                        logger.debug(f"File {t_path} downloaded")
+                        self._got_files.append(t_path)
+                    elif t_out["status"] == "notneeded":
+                        logger.debug(
+                            f"File {t_path} was already present"
+                        )
+                    else:
+                        raise_error(f"File download failed: {t_out}")
+            logger.debug("Get done")
 
-        # append the version of the dataset
-        out["meta"]["datagrabber"][
-            "dataset_commit_id"
-        ] = self._dataset.repo.get_hexsha(
-            self._dataset.repo.get_corresponding_branch()
-        )
         return out
 
     def install(self) -> None:
-        """Install the datalad dataset into the datadir."""
-        logger.debug(f"Installing dataset {self.uri} to {self._datadir}")
-        self._dataset: dl.Dataset = dl.clone(self.uri, self._datadir)
-        logger.debug("Dataset installed")
+        """Install the datalad dataset into the datadir.
 
-    def remove(self):
-        """Remove the datalad dataset from the datadir."""
-        # This probably wants to use `reckless='kill'` or similar.
-        # See issue #53
-        self._dataset.remove(recursive=True)
+        Raises
+        ------
+        ValueError
+            If the dataset is already installed but with a different ID.
+        """
+        isinstalled = dl.Dataset(self._datadir).is_installed()
+        if isinstalled:
+            logger.debug("Dataset already installed")
+            self._got_files = []
+            self._dataset: dl.Dataset = dl.Dataset(self._datadir)
+
+            remote_id = self._get_dataset_id_remote()
+            if remote_id != self._dataset.id:
+                raise_error(
+                    "Dataset already installed but with a different "
+                    f"ID: {self._dataset.id} (local) != {remote_id} (remote)"
+                )
+
+            # Check for dirty datasets:
+            status = self._dataset.status()
+            if any([x["state"] != "clean" for x in status]):
+                self._dataset_dirty = True
+                warn_with_log(
+                    "At least one file is not clean, Junifer will "
+                    "consider this dataset as dirty."
+                )
+            else:
+                logger.debug("Dataset is clean")
+
+        else:
+            logger.debug(f"Installing dataset {self.uri} to {self._datadir}")
+            self._dataset: dl.Dataset = dl.clone(  # type: ignore
+                self.uri, self._datadir, result_renderer="disabled"
+            )
+            logger.debug("Dataset installed")
+        self._was_cloned = not isinstalled
+
+        self._datalad_commit_id = self._dataset.repo.get_hexsha(
+            self._dataset.repo.get_corresponding_branch()
+        )
+
+    def cleanup(self) -> None:
+        """Cleanup the datalad dataset."""
+        if self._was_cloned:
+            logger.debug("Removing dataset with reckless='kill'")
+            self._dataset.remove(reckless="kill", result_renderer="disabled")
+        else:
+            logger.debug("Dropping files that were downloaded")
+            for f in self._got_files:
+                logger.debug(f"Dropping {f}")
+                self._dataset.drop(f, result_renderer="disabled")
 
     def __getitem__(self, element: Union[str, Tuple]) -> Dict[str, Path]:
         """Implement single element indexing in the Datalad database.
@@ -166,6 +243,24 @@ class DataladDataGrabber(BaseDataGrabber):
 
     def __exit__(self, exc_type, exc_value, exc_traceback):
         """Implement context exit."""
-        logger.debug("Removing dataset")
-        self.remove()
-        logger.debug("Dataset removed")
+        logger.debug("Cleaning up dataset")
+        self.cleanup()
+        logger.debug("Dataset state restored")
+
+    def get_meta(self) -> Dict:
+        """Get metadata.
+
+        Returns
+        -------
+        dict
+            The metadata as dictionary.
+
+        """
+        t_meta = super().get_meta()
+        t_meta["datalad_commit_id"] = self._datalad_commit_id
+
+        t_meta["datalad_id"] = self._dataset.id
+
+        # Set a flag to indicate that the dataset was dirty
+        t_meta["datalad_dirty"] = self._dataset_dirty
+        return t_meta
diff --git a/junifer/datagrabber/hcp.py b/junifer/datagrabber/hcp.py
index b8e468ec6..bb67d32e7 100644
--- a/junifer/datagrabber/hcp.py
+++ b/junifer/datagrabber/hcp.py
@@ -2,7 +2,7 @@
 
 from itertools import product
 from pathlib import Path
-from typing import Dict, List, Tuple, Union
+from typing import Dict, List, Union
 
 from junifer.datagrabber.datalad_base import DataladDataGrabber
 
@@ -104,15 +104,20 @@ class HCP1200(PatternDataGrabber):
         )
         self.phase_encodings = phase_encodings
 
-    def __getitem__(self, element: Tuple[str, str, str]) -> Dict[str, Path]:
+    def get_item(
+        self, subject: str, task: str, phase_encoding: str
+    ) -> Dict[str, Path]:
         """Index one element in the dataset.
 
         Parameters
         ----------
-        element : triple of str
-            The element to be indexed. First element in the tuple is the
-            subject, second element is the task, third element is the
-            phase encoding direction.
+        subject : str
+            The subject ID.
+        task : {"REST1", "REST2", "SOCIAL", "WM", "RELATIONAL", "EMOTION", \
+               "LANGUAGE", "GAMBLING", "MOTOR"}
+            The task.
+        phase_encoding : {"LR", "RL"}
+            The phase encoding.
 
         Returns
         -------
@@ -121,20 +126,15 @@ class HCP1200(PatternDataGrabber):
             specified element.
 
         """
-        sub, task, phase_encoding = element
-
         # Resting task
         if "REST" in task:
             new_task = f"rfMRI_{task}"
         else:
             new_task = f"tfMRI_{task}"
 
-        out = super().__getitem__((sub, new_task, phase_encoding))
-        out["meta"]["element"] = {
-            "subject": sub,
-            "task": task,
-            "phase_encoding": phase_encoding,
-        }
+        out = super().get_item(
+            subject=subject, task=new_task, phase_encoding=phase_encoding
+        )
         return out
 
     def get_elements(self) -> List:
@@ -173,17 +173,13 @@ class DataladHCP1200(DataladDataGrabber, HCP1200):
     phase_encodings : {"LR", "RL"} or list of the options, optional
         HCP phase encoding directions. If None, both will be used
         (default None).
-    **kwargs
-        Keyword arguments passed to superclass.
-
     """
 
     def __init__(
         self,
         datadir: Union[str, Path, None] = None,
         tasks: Union[str, List[str], None] = None,
-        phase_encodings: Union[str, List[str], None] = None,
-        **kwargs,
+        phase_encodings: Union[str, List[str], None] = None
     ) -> None:
         uri = (
             "https://github.com/datalad-datasets/"
diff --git a/junifer/datagrabber/multiple.py b/junifer/datagrabber/multiple.py
index ac4370102..68fad38bc 100644
--- a/junifer/datagrabber/multiple.py
+++ b/junifer/datagrabber/multiple.py
@@ -26,9 +26,16 @@ class MultipleDataGrabber(BaseDataGrabber):
     """
 
     def __init__(self, datagrabbers: List[BaseDataGrabber], **kwargs) -> None:
-        # TODO: Check datagrabbers consistency
-        # - same element keys
-        # - no overlapping types
+        # Check datagrabbers consistency
+        # 1) same element keys
+        first_keys = datagrabbers[0].get_element_keys()
+        for dg in datagrabbers[1:]:
+            if dg.get_element_keys() != first_keys:
+                raise ValueError("Datagrabbers have different element keys.")
+        # 2) no overlapping types
+        types = [x for dg in datagrabbers for x in dg.get_types()]
+        if len(types) != len(set(types)):
+            raise ValueError("Datagrabbers have overlapping types.")
         self._datagrabbers = datagrabbers
 
     def __getitem__(self, element: Union[str, Tuple]) -> Dict[str, Path]:
@@ -49,12 +56,34 @@ class MultipleDataGrabber(BaseDataGrabber):
             specified element.
 
         """
+
         out = {}
         for dg in self._datagrabbers:
             t_out = dg[element]
             out.update(t_out)
         return out
 
+    def get_item(self, **element: Dict) -> Dict[str, Dict]:
+        """Get item.
+
+        Parameters
+        ----------
+        element : dict
+            The element to be indexed.
+
+        Returns
+        -------
+        dict
+            Dictionary of paths for each type of data required for the
+            specified element.
+
+        Notes
+        -----
+            This function is not implemented for this class as it is useless.
+        """
+        raise NotImplementedError(
+            "get_item() is not useful for this class, hence not implemented.")
+
     def __enter__(self) -> "BaseDataGrabber":
         """Implement context entry."""
         for dg in self._datagrabbers:
@@ -82,6 +111,19 @@ class MultipleDataGrabber(BaseDataGrabber):
             elements.intersection_update(s)
         return list(elements)
 
+    def get_element_keys(self) -> List[str]:
+        """Get element keys.
+
+        For each item in the ``element`` tuple passed to ``__getitem__()``,
+        this method returns the corresponding key(s).
+
+        Returns
+        -------
+        list of str
+            The element keys.
+        """
+        return self._datagrabbers[0].get_element_keys()
+
     def get_types(self) -> List[str]:
         """Get types.
 
diff --git a/junifer/datagrabber/pattern.py b/junifer/datagrabber/pattern.py
index e67bcb573..65bd43bfc 100644
--- a/junifer/datagrabber/pattern.py
+++ b/junifer/datagrabber/pattern.py
@@ -105,12 +105,12 @@ class PatternDataGrabber(BaseDataGrabber):
             glob_pattern = glob_pattern.replace(f"{{{t_r}}}", "*")
         return re_pattern, glob_pattern, t_replacements
 
-    def _replace_patterns_glob(self, element: Tuple, pattern: str) -> str:
+    def _replace_patterns_glob(self, element: Dict, pattern: str) -> str:
         """Replace patterns with the element so it can be globbed.
 
         Parameters
         ----------
-        element : tuple
+        element : dict
             The element to be used in the replacement.
         pattern : str
             The pattern to be replaced.
@@ -121,27 +121,39 @@ class PatternDataGrabber(BaseDataGrabber):
             The pattern with the element replaced.
 
         """
-        if len(element) != len(self.replacements):
+        if list(element.keys()) != self.replacements:
             raise_error(
-                f"The element length must be {len(self.replacements)}, "
-                f"indicating {self.replacements}."
+                f"The element keys must be {self.replacements}, "
+                f"element has {list(element.keys())}."
             )
-        to_replace = dict(zip(self.replacements, element))
-        return pattern.format(**to_replace)
+        return pattern.format(**element)
 
-    def __getitem__(self, element: Union[str, Tuple]) -> Dict[str, Dict]:
+    def get_element_keys(self) -> List[str]:
+        """Get element keys.
+
+        For each item in the "element" tuple, this functions returns the
+        corresponding key, that is, the ``replacements`` of patterns defined
+        in the constructor.
+
+        Returns
+        -------
+        list of str
+            The element keys.
+
+        """
+        return self.replacements
+
+    def get_item(self, **element: Dict) -> Dict[str, Dict]:
         """Implement single element indexing in the database.
 
-        Each occurrence of the strings in "replacements" is replaced by the
-        corresponding item in the element tuple.
+        This method constructs a real path to the requested item's data, by
+        replacing the ``patterns`` with actual values passed via ``**element``.
 
         Parameters
         ----------
-        element : str or tuple
-            The element to be indexed. If one string is provided, it is
-            assumed to be a tuple with only one item. If a tuple is provided,
-            each item in the tuple is the value for the replacement string
-            specified in "replacements".
+        element : dict
+            The element to be indexed. The keys must be the same as the
+            replacements.
 
         Returns
         -------
@@ -150,9 +162,7 @@ class PatternDataGrabber(BaseDataGrabber):
             specified element.
 
         """
-        out = super().__getitem__(element)
-        if not isinstance(element, tuple):
-            element = (element,)
+        out = {}
         for t_type in self.types:
             t_pattern = self.patterns[t_type]
             t_replace = self._replace_patterns_glob(element, t_pattern)
@@ -175,8 +185,6 @@ class PatternDataGrabber(BaseDataGrabber):
                             f"File {t_out} does not exist"
                         )
             out[t_type] = {"path": t_out}
-        # Meta here is element and types
-        out["meta"]["element"] = dict(zip(self.replacements, element))
         return out
 
     def get_elements(self) -> List:
diff --git a/junifer/datagrabber/tests/test_base.py b/junifer/datagrabber/tests/test_base.py
index 91d622d62..946a1f71a 100644
--- a/junifer/datagrabber/tests/test_base.py
+++ b/junifer/datagrabber/tests/test_base.py
@@ -22,18 +22,24 @@ def test_BaseDataGrabber() -> None:
     """Test BaseDataGrabber."""
     # Create concrete class.
     class MyDataGrabber(BaseDataGrabber):
-        def __getitem__(self, element):
-            return super().__getitem__(element)
+        def get_item(self, subject):
+            return {}
 
         def get_elements(self):
             return super().get_elements()
 
+        def get_element_keys(self):
+            return ["subject"]
+
     dg = MyDataGrabber(datadir="/tmp", types=["func"])
     elem = dg["elem"]
     assert "meta" in elem
     assert "datagrabber" in elem["meta"]
     assert "class" in elem["meta"]["datagrabber"]
     assert MyDataGrabber.__name__ in elem["meta"]["datagrabber"]["class"]
+    assert "element" in elem["meta"]
+    assert "subject" in elem["meta"]["element"]
+    assert "elem" in elem["meta"]["element"]["subject"]
 
     with pytest.raises(NotImplementedError):
         dg.get_elements()
@@ -41,3 +47,19 @@ def test_BaseDataGrabber() -> None:
     with dg:
         assert dg.datadir == Path("/tmp")
         assert dg.types == ["func"]
+
+    class MyDataGrabber2(BaseDataGrabber):
+        def get_item(self, subject):
+            return super().get_item(subject=subject)
+
+        def get_elements(self):
+            return super().get_elements()
+
+        def get_element_keys(self):
+            return super().get_element_keys()
+    dg = MyDataGrabber2(datadir="/tmp", types=["func"])
+    with pytest.raises(NotImplementedError):
+        dg.get_element_keys()
+
+    with pytest.raises(NotImplementedError):
+        dg.get_item(subject=1)  # type: ignore
diff --git a/junifer/datagrabber/tests/test_datalad_base.py b/junifer/datagrabber/tests/test_datalad_base.py
index 2197fc097..4eaebf638 100644
--- a/junifer/datagrabber/tests/test_datalad_base.py
+++ b/junifer/datagrabber/tests/test_datalad_base.py
@@ -5,18 +5,419 @@
 
 import pytest
 
+from pathlib import Path
+
+import datalad.api as dl
+
 from junifer.datagrabber.datalad_base import DataladDataGrabber
 
 
+_testing_dataset = {
+    "example_bids": {
+        "uri": "https://gin.g-node.org/juaml/datalad-example-bids",
+        "commit": "522dfb203afcd2cd55799bf347f9b211919a7338",
+        "id": "fec92475-d9c0-4409-92ba-f041b6a12c40",
+    },
+    "example_bids_ses": {
+        "uri": "https://gin.g-node.org/juaml/datalad-example-bids-ses",
+        "commit": "3d08d55d1faad4f12ab64ac9497544a0d924d47a",
+        "id": "c83500d0-532f-45be-baf1-0dab703bdc2a",
+    },
+}
+
+
 def test_datalad_base_abstractness() -> None:
     """Test datalad base is abstract."""
     with pytest.raises(TypeError, match=r"abstract"):
         DataladDataGrabber()
 
 
-# def test_datalad_base_missing_uri() -> None:
-#     """Test proper check of missing URI in datalad base initialization."""
-#     with pytest.raises(ValueError, match=r"`uri` must be provided"):
-#         DataladDataGrabber(
+@pytest.fixture
+def concrete_datagrabber() -> DataladDataGrabber:
+    """Return a concrete datagrabber class.
 
-#         )
+    Returns
+    -------
+    DataladDataGrabber
+        A concrete datagrabber class.
+
+    """
+
+    class MyDataGrabber(DataladDataGrabber):  # type: ignore
+        def __init__(self, datadir, uri):
+            super().__init__(
+                datadir=datadir,
+                rootdir="example_bids",
+                uri=uri,
+                types=["T1w", "BOLD"],
+            )
+
+        def get_item(self, subject):
+            out = {
+                "T1w": {
+                    "path": self.datadir
+                    / f"{subject}/anat/{subject}_T1w.nii.gz"
+                },
+                "BOLD": {
+                    "path": self.datadir
+                    / f"{subject}/func/{subject}_task-rest_bold.nii.gz"
+                },
+            }
+            return out
+
+        def get_elements(self):
+            return [f"sub-{i:02d}" for i in range(1, 10)]
+
+        def get_element_keys(self):
+            return ["subject"]
+
+    return MyDataGrabber
+
+
+def test_datalad_install_errors(
+    tmp_path: Path, concrete_datagrabber: DataladDataGrabber
+) -> None:
+    """Test datalad base install errors / warnings.
+
+    Parameters
+    ----------
+    tmp_path : pathlib.Path
+        The path to the test directory.
+    concrete_datagrabber : DataladDataGrabber
+        A concrete datagrabber class to use.
+    """
+
+    # Dataset cloned outside of datagrabber
+    datadir = tmp_path / "cloned_uri"
+    uri = _testing_dataset["example_bids"]["uri"]
+    uri2 = _testing_dataset["example_bids_ses"]["uri"]
+
+    # Files are not there
+    assert datadir.exists() is False
+    # Clone dataset
+    dl.clone(uri, datadir)  # type: ignore
+    dg = concrete_datagrabber(datadir=datadir, uri=uri2)
+    with pytest.raises(ValueError, match=r"different ID"):
+        with dg:
+            pass
+
+    elem1_t1w = datadir / "example_bids/sub-01/anat/sub-01_T1w.nii.gz"
+    elem1_t1w.unlink()
+    with open(elem1_t1w, "w") as f:
+        f.write("modified!")
+
+    dg = concrete_datagrabber(datadir=datadir, uri=uri)
+    with pytest.warns(RuntimeWarning, match=r"one file is not clean"):
+        with dg:
+            pass
+
+
+def test_datalad_clone_cleanup(
+    tmp_path: Path, concrete_datagrabber: DataladDataGrabber
+) -> None:
+    """Test datalad base clone and remove.
+
+    Parameters
+    ----------
+    tmp_path : pathlib.Path
+        The path to the test directory.
+    concrete_datagrabber : DataladDataGrabber
+        A concrete datagrabber class to use.
+    """
+
+    # Clone whole dataset
+    datadir = tmp_path / "newclone"
+    uri = _testing_dataset["example_bids"]["uri"]
+    elem1_bold = (
+        datadir / "example_bids/sub-01/func/sub-01_task-rest_bold.nii.gz"
+    )
+    elem1_t1w = datadir / "example_bids/sub-01/anat/sub-01_T1w.nii.gz"
+
+    assert datadir.exists() is False
+    assert elem1_bold.is_file() is False
+    assert elem1_t1w.is_file() is False
+    with concrete_datagrabber(datadir=datadir, uri=uri) as dg:
+        assert datadir.exists() is True
+        assert dg._was_cloned is True
+        assert elem1_bold.is_file() is False
+        assert elem1_bold.is_symlink() is True
+        assert elem1_t1w.is_file() is False
+        assert elem1_t1w.is_symlink() is True
+        elem1 = dg["sub-01"]
+        assert "meta" in elem1
+        assert "datagrabber" in elem1["meta"]
+        assert "datalad_dirty" in elem1["meta"]["datagrabber"]
+        assert elem1["meta"]["datagrabber"]["datalad_dirty"] is False
+        assert hasattr(dg, "_got_files") is False
+        assert datadir.exists() is True
+        assert elem1_bold.is_file() is True
+        assert elem1_bold.is_symlink() is True
+        assert elem1_t1w.is_file() is True
+        assert elem1_t1w.is_symlink() is True
+
+    assert datadir.exists() is False
+    assert len(list(datadir.glob("*"))) == 0
+
+
+def test_datalad_previously_cloned(
+    tmp_path: Path, concrete_datagrabber: DataladDataGrabber
+) -> None:
+    """Test datalad base on cloned dataset.
+
+    Parameters
+    ----------
+    tmp_path : pathlib.Path
+        The path to the test directory.
+    concrete_datagrabber : DataladDataGrabber
+        A concrete datagrabber class to use.
+    """
+
+    # Dataset cloned outside of datagrabber
+    datadir = tmp_path / "cloned"
+    elem1_bold = (
+        datadir / "example_bids/sub-01/func/sub-01_task-rest_bold.nii.gz"
+    )
+    elem1_t1w = datadir / "example_bids/sub-01/anat/sub-01_T1w.nii.gz"
+    uri = _testing_dataset["example_bids"]["uri"]
+    commit = _testing_dataset["example_bids"]["commit"]
+    remote_id = _testing_dataset["example_bids"]["id"]
+    # Files are not there
+    assert datadir.exists() is False
+    assert elem1_bold.exists() is False
+    assert elem1_t1w.exists() is False
+
+    # Clone dataset
+    dl.clone(uri, datadir, result_renderer="disabled")  # type: ignore
+
+    # Files are there, but are empty symbolic links
+    assert datadir.exists() is True
+    assert elem1_bold.is_symlink() is True
+    assert elem1_bold.is_file() is False
+    assert elem1_t1w.is_symlink() is True
+    assert elem1_t1w.is_file() is False
+    with concrete_datagrabber(datadir=datadir, uri=uri) as dg:
+        assert datadir.exists() is True
+        assert dg._was_cloned is False
+        elem1 = dg["sub-01"]
+        assert "meta" in elem1
+        assert "datagrabber" in elem1["meta"]
+        assert "datalad_dirty" in elem1["meta"]["datagrabber"]
+        assert elem1["meta"]["datagrabber"]["datalad_dirty"] is False
+        assert "datalad_commit_id" in elem1["meta"]["datagrabber"]
+        assert elem1["meta"]["datagrabber"]["datalad_commit_id"] == commit
+        assert "datalad_id" in elem1["meta"]["datagrabber"]
+        assert elem1["meta"]["datagrabber"]["datalad_id"] == remote_id
+
+        assert hasattr(dg, "_got_files") is True
+        # Files are there and symlinks are fixed
+        assert elem1["BOLD"]["path"].is_file() is True
+        assert elem1["BOLD"]["path"].is_symlink() is True
+        assert elem1["T1w"]["path"].is_file() is True
+        assert elem1["T1w"]["path"].is_symlink() is True
+
+        # Datagrabber fetched two files
+        assert len(dg._got_files) == 2
+        assert any(x.name == "sub-01_T1w.nii.gz" for x in dg._got_files)
+        assert any(
+            x.name == "sub-01_task-rest_bold.nii.gz" for x in dg._got_files
+        )
+
+    assert datadir.exists() is True
+    assert len(list(datadir.glob("*"))) > 0
+
+
+def test_datalad_previously_cloned_and_get(
+    tmp_path: Path, concrete_datagrabber: DataladDataGrabber
+) -> None:
+    """Test datalad base on cloned dataset with files present.
+
+    Parameters
+    ----------
+    tmp_path : pathlib.Path
+        The path to the test directory.
+    concrete_datagrabber : DataladDataGrabber
+        A concrete datagrabber class to use.
+    """
+
+    # Dataset cloned outside of datagrabber with some files present
+    datadir = tmp_path / "cloned_clean"
+    elem1_bold = (
+        datadir / "example_bids/sub-01/func/sub-01_task-rest_bold.nii.gz"
+    )
+    elem1_t1w = datadir / "example_bids/sub-01/anat/sub-01_T1w.nii.gz"
+    uri = _testing_dataset["example_bids"]["uri"]
+    commit = _testing_dataset["example_bids"]["commit"]
+    remote_id = _testing_dataset["example_bids"]["id"]
+
+    # Files are not there
+    assert datadir.exists() is False
+    assert elem1_bold.exists() is False
+    assert elem1_t1w.exists() is False
+
+    # Clone dataset
+    dl.clone(uri, datadir, result_renderer="disabled")  # type: ignore
+
+    # Files are there, but are empty symbolic links
+    assert datadir.exists() is True
+    assert elem1_bold.is_symlink() is True
+    assert elem1_bold.is_file() is False
+    assert elem1_t1w.is_symlink() is True
+    assert elem1_t1w.is_file() is False
+
+    dl.get(  # type: ignore
+        elem1_t1w, dataset=datadir, result_renderer="disabled"
+    )
+
+    assert elem1_bold.is_symlink() is True
+    assert elem1_bold.is_file() is False
+    assert elem1_t1w.is_symlink() is True
+    assert elem1_t1w.is_file() is True
+
+    with concrete_datagrabber(datadir=datadir, uri=uri) as dg:
+        assert datadir.exists() is True
+        assert dg._was_cloned is False
+        elem1 = dg["sub-01"]
+        assert "meta" in elem1
+        assert "datagrabber" in elem1["meta"]
+        assert "datalad_dirty" in elem1["meta"]["datagrabber"]
+        assert elem1["meta"]["datagrabber"]["datalad_dirty"] is False
+        assert "datalad_commit_id" in elem1["meta"]["datagrabber"]
+        assert elem1["meta"]["datagrabber"]["datalad_commit_id"] == commit
+        assert "datalad_id" in elem1["meta"]["datagrabber"]
+        assert elem1["meta"]["datagrabber"]["datalad_id"] == remote_id
+
+        assert hasattr(dg, "_got_files") is True
+        # Files are there and symlinks are fixed
+        assert elem1["BOLD"]["path"].is_file() is True
+        assert elem1["BOLD"]["path"].is_symlink() is True
+        assert elem1["T1w"]["path"].is_file() is True
+        assert elem1["T1w"]["path"].is_symlink() is True
+
+        # Datagrabber fetched two files
+        assert len(dg._got_files) == 1
+        assert dg._got_files[0].name == "sub-01_task-rest_bold.nii.gz"
+
+    assert datadir.exists() is True
+    assert len(list(datadir.glob("*"))) > 0
+
+    # Same state as before using the datagrabber
+    assert elem1_bold.is_symlink() is True
+    assert elem1_bold.is_file() is False
+    assert elem1_t1w.is_symlink() is True
+    assert elem1_t1w.is_file() is True
+
+
+def test_datalad_previously_cloned_and_get_dirty(
+    tmp_path: Path, concrete_datagrabber: DataladDataGrabber
+) -> None:
+    """Test datalad base on a dirty cloned dataset.
+
+    Parameters
+    ----------
+    tmp_path : pathlib.Path
+        The path to the test directory.
+    concrete_datagrabber : DataladDataGrabber
+        A concrete datagrabber class to use.
+    """
+
+    # Dataset cloned outside of datagrabber with some files present and dirty
+    datadir = tmp_path / "cloned_dirty"
+    elem1_bold = (
+        datadir / "example_bids/sub-01/func/sub-01_task-rest_bold.nii.gz"
+    )
+    elem1_t1w = datadir / "example_bids/sub-01/anat/sub-01_T1w.nii.gz"
+    uri = _testing_dataset["example_bids"]["uri"]
+    commit = _testing_dataset["example_bids"]["commit"]
+    remote_id = _testing_dataset["example_bids"]["id"]
+
+    # Files are not there
+    assert datadir.exists() is False
+    assert elem1_bold.exists() is False
+    assert elem1_t1w.exists() is False
+
+    # Clone dataset
+    dl.clone(uri, datadir, result_renderer="disabled")  # type: ignore
+
+    # Files are there, but are empty symbolic links
+    assert datadir.exists() is True
+    assert elem1_bold.is_symlink() is True
+    assert elem1_bold.is_file() is False
+    assert elem1_t1w.is_symlink() is True
+    assert elem1_t1w.is_file() is False
+
+    dl.get(  # type: ignore
+        elem1_t1w, dataset=datadir, result_renderer="disabled"
+    )
+
+    assert elem1_bold.is_symlink() is True
+    assert elem1_bold.is_file() is False
+    assert elem1_t1w.is_symlink() is True
+    assert elem1_t1w.is_file() is True
+
+    elem1_t1w.unlink()
+    with open(elem1_t1w, "w") as f:
+        f.write("modified!")
+
+    with concrete_datagrabber(datadir=datadir, uri=uri) as dg:
+        assert datadir.exists() is True
+        assert dg._was_cloned is False
+        elem1 = dg["sub-01"]
+        assert "meta" in elem1
+        assert "datagrabber" in elem1["meta"]
+        assert "datalad_dirty" in elem1["meta"]["datagrabber"]
+        assert elem1["meta"]["datagrabber"]["datalad_dirty"] is True
+        assert "datalad_commit_id" in elem1["meta"]["datagrabber"]
+        assert elem1["meta"]["datagrabber"]["datalad_commit_id"] == commit
+        assert "datalad_id" in elem1["meta"]["datagrabber"]
+        assert elem1["meta"]["datagrabber"]["datalad_id"] == remote_id
+
+        assert hasattr(dg, "_got_files") is True
+        # Files are there and symlinks are fixed
+        assert elem1["BOLD"]["path"].is_file() is True
+        assert elem1["BOLD"]["path"].is_symlink() is True
+        assert elem1["T1w"]["path"].is_file() is True
+        assert elem1["T1w"]["path"].is_symlink() is False
+
+        # Datagrabber fetched two files
+        assert len(dg._got_files) == 1
+        assert dg._got_files[0].name == "sub-01_task-rest_bold.nii.gz"
+
+    # Now get another subject that has not been modified
+    with concrete_datagrabber(datadir=datadir, uri=uri) as dg:
+        assert datadir.exists() is True
+        assert dg._was_cloned is False
+        elem2 = dg["sub-02"]
+        assert "meta" in elem2
+        assert "datagrabber" in elem2["meta"]
+        assert "datalad_dirty" in elem2["meta"]["datagrabber"]
+
+        # Dataset is still dirty due to subject sub-01
+        assert elem2["meta"]["datagrabber"]["datalad_dirty"] is True
+
+        assert "datalad_commit_id" in elem2["meta"]["datagrabber"]
+        assert elem2["meta"]["datagrabber"]["datalad_commit_id"] == commit
+        assert "datalad_id" in elem2["meta"]["datagrabber"]
+        assert elem2["meta"]["datagrabber"]["datalad_id"] == remote_id
+
+        assert hasattr(dg, "_got_files") is True
+        # Files are there and symlinks are fixed
+        assert elem2["BOLD"]["path"].is_file() is True
+        assert elem2["BOLD"]["path"].is_symlink() is True
+        assert elem2["T1w"]["path"].is_file() is True
+        assert elem2["T1w"]["path"].is_symlink() is True
+
+        # Datagrabber fetched two files
+        assert len(dg._got_files) == 2
+        assert any(x.name == "sub-02_T1w.nii.gz" for x in dg._got_files)
+        assert any(
+            x.name == "sub-02_task-rest_bold.nii.gz" for x in dg._got_files
+        )
+
+    assert datadir.exists() is True
+    assert len(list(datadir.glob("*"))) > 0
+
+    # Same state as before using the datagrabber
+    assert elem1_bold.is_symlink() is True
+    assert elem1_bold.is_file() is False
+    assert elem1_t1w.is_symlink() is False
+    assert elem1_t1w.is_file() is True
diff --git a/junifer/datagrabber/tests/test_multiple.py b/junifer/datagrabber/tests/test_multiple.py
index 5e1298d3a..badfcea34 100644
--- a/junifer/datagrabber/tests/test_multiple.py
+++ b/junifer/datagrabber/tests/test_multiple.py
@@ -3,13 +3,15 @@
 # Authors: Federico Raimondo <f.raimondo@fz-juelich.de>
 # License: AGPL
 
+import pytest
+
 from junifer.datagrabber import MultipleDataGrabber, PatternDataladDataGrabber
 
 
 _testing_dataset = {
     "example_bids": {
         "uri": "https://gin.g-node.org/juaml/datalad-example-bids",
-        "id": "e2ce149bd723088769a86c72e57eded009258c6b",
+        "id": "522dfb203afcd2cd55799bf347f9b211919a7338",
     },
     "example_bids_ses": {
         "uri": "https://gin.g-node.org/juaml/datalad-example-bids-ses",
@@ -109,3 +111,60 @@ def test_multiple_no_intersection() -> None:
     with dg:
         subs = [x for x in dg]
         assert set(subs) == set(expected_subs)
+
+
+def test_multiple_get_item() -> None:
+    """Test a multiple datagrabber get_item error."""
+    repo_uri1 = _testing_dataset["example_bids"]["uri"]
+    rootdir = "example_bids_ses"
+    replacements = ["subject", "session"]
+    pattern1 = {
+        "T1w": "{subject}/{session}/anat/{subject}_{session}_T1w.nii.gz",
+    }
+    dg1 = PatternDataladDataGrabber(
+        rootdir=rootdir,
+        uri=repo_uri1,
+        types=["T1w"],
+        patterns=pattern1,
+        replacements=replacements,
+    )
+
+    dg = MultipleDataGrabber([dg1])
+    with pytest.raises(NotImplementedError):
+        dg.get_item(subject="sub-01")  # type: ignore
+
+
+def test_multiple_validation() -> None:
+    """Test a multiple datagrabber init validation."""
+    repo_uri1 = _testing_dataset["example_bids"]["uri"]
+    repo_uri2 = _testing_dataset["example_bids_ses"]["uri"]
+    rootdir = "example_bids_ses"
+    replacement1 = ["subject", "session"]
+    replacement2 = ["subject"]
+    pattern1 = {
+        "T1w": "{subject}/{session}/anat/{subject}_{session}_T1w.nii.gz",
+    }
+    pattern2 = {
+        "bold": "{subject}/func/{subject}_task-rest_bold.nii.gz",
+    }
+    dg1 = PatternDataladDataGrabber(
+        rootdir=rootdir,
+        uri=repo_uri1,
+        types=["T1w"],
+        patterns=pattern1,
+        replacements=replacement1,
+    )
+
+    dg2 = PatternDataladDataGrabber(
+        rootdir=rootdir,
+        uri=repo_uri2,
+        types=["bold"],
+        patterns=pattern2,
+        replacements=replacement2,
+    )
+
+    with pytest.raises(ValueError, match="different element key"):
+        MultipleDataGrabber([dg1, dg2])
+
+    with pytest.raises(ValueError, match="overlapping types"):
+        MultipleDataGrabber([dg1, dg1])
diff --git a/junifer/datagrabber/tests/test_pattern.py b/junifer/datagrabber/tests/test_pattern.py
index 472934d2c..551cc2571 100644
--- a/junifer/datagrabber/tests/test_pattern.py
+++ b/junifer/datagrabber/tests/test_pattern.py
@@ -105,7 +105,7 @@ def test_PatternDataGrabber_errors(tmp_path: Path) -> None:
         replacements=["subject", "session"],
     )
 
-    with pytest.raises(ValueError, match="element length must be"):
+    with pytest.raises(ValueError, match="element keys must be"):
         datagrabber["sub001"]
 
     # This should not work, file does not exists
diff --git a/junifer/datagrabber/tests/test_pattern_datalad.py b/junifer/datagrabber/tests/test_pattern_datalad.py
index 7cacf7b60..ec8f3bb37 100644
--- a/junifer/datagrabber/tests/test_pattern_datalad.py
+++ b/junifer/datagrabber/tests/test_pattern_datalad.py
@@ -15,11 +15,13 @@ from junifer.datagrabber.pattern_datalad import PatternDataladDataGrabber
 _testing_dataset = {
     "example_bids": {
         "uri": "https://gin.g-node.org/juaml/datalad-example-bids",
-        "id": "e2ce149bd723088769a86c72e57eded009258c6b",
+        "commit": "522dfb203afcd2cd55799bf347f9b211919a7338",
+        "id": "fec92475-d9c0-4409-92ba-f041b6a12c40",
     },
     "example_bids_ses": {
         "uri": "https://gin.g-node.org/juaml/datalad-example-bids-ses",
-        "id": "3d08d55d1faad4f12ab64ac9497544a0d924d47a",
+        "commit": "3d08d55d1faad4f12ab64ac9497544a0d924d47a",
+        "id": "c83500d0-532f-45be-baf1-0dab703bdc2a",
     },
 }
 
@@ -56,7 +58,7 @@ def test_bids_PatternDataladDataGrabber(tmp_path: Path) -> None:
 
     repo_uri = _testing_dataset["example_bids"]["uri"]
     rootdir = "example_bids"
-    repo_commit = _testing_dataset["example_bids"]["id"]
+    repo_commit = _testing_dataset["example_bids"]["commit"]
 
     with PatternDataladDataGrabber(
         rootdir=rootdir,
@@ -87,11 +89,11 @@ def test_bids_PatternDataladDataGrabber(tmp_path: Path) -> None:
             assert dg_meta["class"] == "PatternDataladDataGrabber"
             assert "uri" in dg_meta
             assert dg_meta["uri"] == repo_uri
-            assert "dataset_commit_id" in dg_meta
-            assert dg_meta["dataset_commit_id"] == repo_commit
+            assert "datalad_commit_id" in dg_meta
+            assert dg_meta["datalad_commit_id"] == repo_commit
 
             with open(t_sub["T1w"]["path"], "r") as f:
-                assert f.readlines()[0] == "placeholder"
+                assert f.readlines()[0].startswith("placeholder")
 
 
 def test_bids_PatternDataladDataGrabber_datadir(tmp_path: Path) -> None:
diff --git a/junifer/testing/datagrabbers.py b/junifer/testing/datagrabbers.py
index 57192f23a..7253ab7a7 100644
--- a/junifer/testing/datagrabbers.py
+++ b/junifer/testing/datagrabbers.py
@@ -24,13 +24,24 @@ class OasisVBMTestingDatagrabber(BaseDataGrabber):
         types = ["VBM_GM"]
         super().__init__(types=types, datadir=datadir)
 
-    def __getitem__(self, element: str) -> Dict:
+    def get_element_keys(self) -> List[str]:
+        """Get element keys.
+
+        Returns
+        -------
+        list of str
+            The element keys.
+
+        """
+        return ["subject"]
+
+    def get_item(self, subject: str) -> Dict[str, Dict]:
         """Implement indexing support.
 
         Parameters
         ----------
-        element : str
-            The element to retrieve.
+        subject : str
+            The subject to retrieve.
 
         Returns
         -------
@@ -38,11 +49,10 @@ class OasisVBMTestingDatagrabber(BaseDataGrabber):
             The data along with the metadata.
 
         """
-        out = super().__getitem__(element)
-        i_sub = int(element.split("-")[1]) - 1
+        out = {}
+        i_sub = int(subject.split("-")[1]) - 1
         out["VBM_GM"] = {"path": Path(self._dataset.gray_matter_maps[i_sub])}
-        # Set the element accordingly
-        out["meta"]["element"] = {"subject": element}
+
         return out
 
     def __enter__(self) -> "OasisVBMTestingDatagrabber":
@@ -82,6 +92,17 @@ class SPMAuditoryTestingDatagrabber(BaseDataGrabber):
         types = ["BOLD", "T1w"]  # TODO: Check that they are T1w
         super().__init__(types=types, datadir=datadir)
 
+    def get_element_keys(self) -> List[str]:
+        """Get element keys.
+
+        Returns
+        -------
+        list of str
+            The element keys.
+
+        """
+        return ["subject"]
+
     def get_elements(self) -> List[str]:
         """Get elements.
 
@@ -93,13 +114,13 @@ class SPMAuditoryTestingDatagrabber(BaseDataGrabber):
         """
         return [f"sub{x:03d}" for x in list(range(1, 11))]
 
-    def __getitem__(self, element: str) -> Dict:
+    def get_item(self, subject: str) -> Dict[str, Dict]:
         """Implement indexing support.
 
         Parameters
         ----------
-        element : str
-            The element to retrieve.
+        subject : str
+            The subject to retrieve.
 
         Returns
         -------
@@ -107,20 +128,17 @@ class SPMAuditoryTestingDatagrabber(BaseDataGrabber):
             The data along with the metadata.
 
         """
-        out = super().__getitem__(element)
-
-        nilearn_data = datasets.fetch_spm_auditory(subject_id=element)
+        out = {}
+        nilearn_data = datasets.fetch_spm_auditory(subject_id=subject)
         fmri_img = image.concat_imgs(nilearn_data.func)  # type: ignore
         anat_img = image.concat_imgs(nilearn_data.anat)  # type: ignore
 
-        fmri_fname = self.datadir / f"{element}_bold.nii.gz"
-        anat_fname = self.datadir / f"{element}_T1w.nii.gz"
+        fmri_fname = self.datadir / f"{subject}_bold.nii.gz"
+        anat_fname = self.datadir / f"{subject}_T1w.nii.gz"
         nib.save(fmri_img, fmri_fname)
         nib.save(anat_img, anat_fname)
         out["BOLD"] = {"path": fmri_fname}
         out["T1w"] = {"path": anat_fname}
-        # Set the element accordingly
-        out["meta"]["element"] = {"subject": element}
         return out
 
 
@@ -176,6 +194,17 @@ class PartlyCloudyTestingDataGrabber(BaseDataGrabber):
         )
         return self
 
+    def get_element_keys(self) -> List[str]:
+        """Get element keys.
+
+        Returns
+        -------
+        list of str
+            The element keys.
+
+        """
+        return ["subject"]
+
     def get_elements(self) -> List[str]:
         """Get elements.
 
@@ -187,13 +216,13 @@ class PartlyCloudyTestingDataGrabber(BaseDataGrabber):
         """
         return [f"sub-{x:02d}" for x in list(range(1, 11))]
 
-    def __getitem__(self, element: str) -> Dict:
+    def get_item(self, subject: str) -> Dict[str, Dict]:
         """Implement indexing support.
 
         Parameters
         ----------
-        element : str
-            The element to retrieve.
+        subject : str
+            The subject to retrieve.
 
         Returns
         -------
@@ -201,8 +230,8 @@ class PartlyCloudyTestingDataGrabber(BaseDataGrabber):
             The data along with the metadata.
 
         """
-        out = super().__getitem__(element)
-        i_sub = int(element.split("-")[1]) - 1
+        out = {}
+        i_sub = int(subject.split("-")[1]) - 1
         out["BOLD"] = {"path": Path(self._dataset["func"][i_sub])}
         conf_format = "fmriprep"
 
@@ -211,6 +240,4 @@ class PartlyCloudyTestingDataGrabber(BaseDataGrabber):
             "format": conf_format,
         }
 
-        # Set the element accordingly
-        out["meta"]["element"] = {"subject": element}
         return out
diff --git a/junifer/utils/logging.py b/junifer/utils/logging.py
index 0cceed96b..679f0797f 100644
--- a/junifer/utils/logging.py
+++ b/junifer/utils/logging.py
@@ -11,10 +11,13 @@ from pathlib import Path
 from subprocess import PIPE, Popen, TimeoutExpired
 from typing import Dict, NoReturn, Optional, Type, Union
 from warnings import warn
-
+import datalad
 
 logger = logging.getLogger("JUNIFER")
 
+# Set up datalad logger level to warning by default
+datalad.log.lgr.setLevel(logging.WARNING)
+
 _logging_types = {
     "DEBUG": logging.DEBUG,
     "INFO": logging.INFO,
@@ -253,6 +256,7 @@ def configure_logging(
 
     lh.setFormatter(formatter)  # set formatter
     logger.setLevel(level)  # set level
+    datalad.log.lgr.setLevel(level)  # set level for datalad
     logger.addHandler(lh)  # set handler
     log_versions()  # log versions of installed packages
 
diff --git a/tools/create_bids_example_dataset.py b/tools/create_bids_example_dataset.py
index e985bc29c..fc665ca05 100644
--- a/tools/create_bids_example_dataset.py
+++ b/tools/create_bids_example_dataset.py
@@ -27,7 +27,7 @@ with TemporaryDirectory() as tmpdir_name:
                   f'func/{t_sub}_task-rest_bold.json']
         for fname in fnames:
             with open(sub_dir / fname, 'w') as f:
-                f.write('placeholder')
+                f.write(f'placeholder-{fname}')
 
     ds.save(recursive=True)
     ds.siblings('add', name='gin', url=dst)
diff --git a/tools/create_bids_example_dataset_sessions.py b/tools/create_bids_example_dataset_sessions.py
index 3301c6f8a..9d798b2c5 100644
--- a/tools/create_bids_example_dataset_sessions.py
+++ b/tools/create_bids_example_dataset_sessions.py
@@ -34,7 +34,7 @@ with TemporaryDirectory() as tmpdir_name:
                     f'func/{t_sub}_{t_ses}_task-rest_bold.json'])
             for fname in fnames:
                 with open(ses_dir / fname, 'w') as f:
-                    f.write('placeholder')
+                    f.write('placeholder-{fname}')
 
     ds.save(recursive=True)
     ds.siblings('add', name='gin', url=dst)