Throw TypeError on invalid destination, add _metadata_path attribute

rbackup/hierarchy/hierarchy.py

@@ -3,8 +3,13 @@
 .. module:: rbackup.hierarchy.hierarchy
     :synopsis: Classes for creating the backup hierarchy.
 """
+import logging
+
 from pathlib import Path
 
+# ========== Logging Setup ===========
+syslog = logging.getLogger(__name__)
+
 
 # ========== Classes ==========
 class Hierarchy:
@@ -32,7 +37,12 @@ class Hierarchy:
         :param dest: the root directory of the backup hierarchy
         :type dest: str, path-like object
         """
-        self._path = Path(dest)
+        try:
+            self._path = Path(dest)
+        except TypeError as e:
+            raise e
+
+        self._metadata_path = self.path / ".metadata"
 
     @property
     def path(self):