feature(backups): placeholders for the backupers and backup providers

selfprivacy_api/backup/__init__.py

@@ -0,0 +1,5 @@
+from abc import ABC
+
+class AbstractBackuper(ABC):
+    def __init__(self):
+        pass

selfprivacy_api/backup/providers/backblaze.py

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+from .provider import AbstractBackupProvider
+from selfprivacy_api.backup.restic_backuper import ResticBackuper
+
+
+class Backblaze(AbstractBackupProvider):
+    backuper = ResticBackuper()

selfprivacy_api/backup/providers/provider.py

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+"""
+An abstract class for BackBlaze, S3 etc.
+It assumes that while some providers are supported via restic/rclone, others may
+require different backends
+"""
+from abc import ABC
+from selfprivacy_api.backup import AbstractBackuper
+
+
+class AbstractBackupProvider(ABC):
+    @property
+    def backuper(self) -> AbstractBackuper:
+        raise NotImplementedError

selfprivacy_api/backup/restic_backuper.py

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+from selfprivacy_api.backup import AbstractBackuper
+
+
+class ResticBackuper(AbstractBackuper):
+    def __init__(self):
+        pass