Start class layouts for backups and plugins API

cura/Backups/BackupsManager.py

@@ -0,0 +1,28 @@
+# Copyright (c) 2018 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+from zipfile import ZipFile
+
+
+class BackupsManager:
+    """
+    The BackupsManager is responsible for managing the creating and restoring of backups.
+    Backups themselves are represented in a different class.
+    """
+
+    def __init__(self):
+        pass
+
+    def createBackup(self) -> ("ZipFile", dict):
+        """
+        Get a backup of the current configuration.
+        :return: A Tuple containing a ZipFile (the actual backup) and a dict containing some meta data (like version).
+        """
+        pass
+
+    def restoreBackup(self, zip_file: "ZipFile", meta_data: dict) -> None:
+        """
+        Restore a backup from a given ZipFile.
+        :param zip_file: A ZipFile containing the actual backup.
+        :param meta_data: A dict containing some meta data that is needed to restore the backup correctly.
+        """
+        pass