Don't calculate private attributes each time the Hierarchy's properties

are called

rbackup/struct/hierarchy.py

@@ -48,6 +48,8 @@ class Hierarchy(PathLike):
         :type dest: str or path-like object
         """
         self._path = Path(dest).resolve()
+        self._metadata_path = self._path / ".metadata"
+        self._name = self._path.name
 
     def __fspath__(self):
         return str(self._path)
@@ -70,7 +72,7 @@ class Hierarchy(PathLike):
 
         :rtype: str
         """
-        return self._path.name
+        return self._name
 
     @property
     def metadata_path(self):
@@ -78,7 +80,7 @@ class Hierarchy(PathLike):
 
         :rtype: path-like object
         """
-        return self._path / ".metadata"
+        return self._metadata_path
 
     def gen_metadata(self):
         """Generate metadata for this repository.

rbackup/struct/snapshot.py

@@ -32,6 +32,8 @@ class Snapshot(Hierarchy):
         """Default constructor for the Snapshot class."""
         super().__init__(path)
 
+        self._pkg_dir = self.path / "pkg"
+
     def __repr__(self):
         """Return a string representation of this Snapshot."""
         return f"{self.__class__.__name__}('{self.name}')"
@@ -42,7 +44,7 @@ class Snapshot(Hierarchy):
 
         :rtype: path-like object
         """
-        return self.path / "pkg"
+        return self._pkg_dir
 
     def gen_metadata(self):
         """Generate metadata for this repository.