diff --git a/rbackup/struct/hierarchy.py b/rbackup/struct/hierarchy.py
index b52369d..5701958 100644
--- a/rbackup/struct/hierarchy.py
+++ b/rbackup/struct/hierarchy.py
@@ -47,10 +47,7 @@ class Hierarchy(PathLike):
         :param dest: the root directory of the backup hierarchy
         :type dest: str or path-like object
         """
-        try:
-            self._path = Path(dest).resolve()
-        except TypeError as e:
-            raise e
+        self._path = Path(dest).resolve()
 
     def __fspath__(self):
         return str(self._path)
@@ -85,7 +82,7 @@ class Hierarchy(PathLike):
 
     def gen_metadata(self):
         """Generate metadata for this repository.
-            After this method is called, the data necessary for this repository has been created.
+            After this method is called, the data necessary for this hierarchy has been created.
         """
         raise NotImplementedError("This method must be called in a child class.")
 
diff --git a/rbackup/struct/repository.py b/rbackup/struct/repository.py
index 7a37f4a..5d5d163 100644
--- a/rbackup/struct/repository.py
+++ b/rbackup/struct/repository.py
@@ -38,11 +38,11 @@ class Repository(Hierarchy):
 
     Attributes
     ----------
-    * path (inherited from Hierarchy)
-    * name (inherited from Hierarchy)
-    * metadata_path (inherited from Hierarchy)
-    * snapshots - a list of snapshots stored in this repository
-    * snapshot_dir - the snapshot storage location of this repository
+    * Repository.path (inherited from Hierarchy)
+    * Repository.name (inherited from Hierarchy)
+    * Repository.metadata_path (inherited from Hierarchy)
+    * Repository.snapshots - a list of snapshots stored in this repository
+    * Repository.snapshot_dir - the snapshot storage location of this repository
 
     Methods
     -------
@@ -170,6 +170,12 @@ class Repository(Hierarchy):
         """
         return not self.snapshots
 
+    def gen_metadata(self):
+        """Generate metadata for this repository.
+            After this method is called, the data necessary for this snapshot has been created.
+        """
+        pass
+
     def create_snapshot(self, name=None):
         """Create a new snapshot in this repository.
 
diff --git a/rbackup/struct/snapshot.py b/rbackup/struct/snapshot.py
index 959e99f..2b9403c 100644
--- a/rbackup/struct/snapshot.py
+++ b/rbackup/struct/snapshot.py
@@ -16,10 +16,10 @@ class Snapshot(Hierarchy):
     """Hierarchy for a single snapshot.
     Attributes
     ----------
-    * path (inherited from Hierarchy)
-    * name (inherited from Hierarchy)
-    * metadata_path (inherited from Hierarchy)
-    * pkg_dir
+    * Snapshot.path (inherited from Hierarchy)
+    * Snapshot.name (inherited from Hierarchy)
+    * Snapshot.metadata_path (inherited from Hierarchy)
+    * Snapshot.pkg_dir
 
     Methods
     -------
@@ -44,6 +44,12 @@ class Snapshot(Hierarchy):
         """
         return self.path / "pkg"
 
+    def gen_metadata(self):
+        """Generate metadata for this repository.
+            After this method is called, the data necessary for this snapshot has been created.
+        """
+        pass
+
 
 # ========== Functions ==========
 if __name__ == "__main__":