Queue long-running backup and upload

services/queue.py

@@ -0,0 +1,19 @@
+import asyncio
+from typing import Awaitable, Callable
+
+
+_queue: asyncio.Queue = asyncio.Queue()
+
+
+async def enqueue(job: Callable[[], Awaitable[None]]) -> int:
+    await _queue.put(job)
+    return _queue.qsize()
+
+
+async def worker():
+    while True:
+        job = await _queue.get()
+        try:
+            await job()
+        finally:
+            _queue.task_done()