Create, download, and restore Qdrant snapshots (collection, shard, and full-storage) for backup and migration

Documented steps

1. Create a collection snapshot: POST /collections/{collection_name}/snapshots. Synchronous; returns {"result":{"name":"...snapshot","creation_time":"...","size":18956800},"status":"ok"}.
2. List snapshots: GET /collections/{collection_name}/snapshots.
3. Download: GET /collections/{collection_name}/snapshots/{snapshot_name} with header 'api-key: <API_KEY>' (REST only), e.g. wget <url> --header="api-key: $QDRANT_API_KEY" -O out.snapshot.
4. Restore by upload: POST /collections/{collection_name}/snapshots/upload?priority=snapshot as multipart with form field snapshot=@file.snapshot plus the api-key header.
5. Restore from URL or local path: PUT /collections/{collection_name}/snapshots/recover with {"location":"http://host:6333/collections/x/snapshots/name.snapshot" or "file:///qdrant/snapshots/name.snapshot","priority":"snapshot","checksum":"<sha256>","api_key":"<remote key if protected>"}.
6. Full-storage (whole-node) snapshots: create POST /snapshots, list GET /snapshots, download GET /snapshots/{snapshot_name}, delete DELETE /snapshots/{snapshot_name}. These include collection aliases.
7. Restore a full-storage snapshot only via CLI at startup on a single node: ./qdrant --storage-snapshot /path/to/snapshot.snapshot.
8. Shard-level snapshot in a distributed cluster: POST /collections/{collection_name}/shards/{shard_id}/snapshots.
9. In a multi-node cluster, snapshot every node separately — one snapshot holds only that node's shard data.
10. Reference: https://qdrant.tech/documentation/snapshots/
11. Reference: https://qdrant.tech/documentation/database-tutorials/create-snapshot/
12. Reference: https://api.qdrant.tech/api-reference/snapshots/recover-from-snapshot