zlacker

Some minor data is in postgres, but to test it I just fed it a previous install's library folder (images and metadata files). Worked fine, restored all my albums and tags, though perhaps not "people" iirc. And not e.g. ML image content search, of course, you need to re-generate that. And the metadata files were more than obvious enough to satisfy my "I can do this by hand if I really need to" bar, and recreating the accounts by hand is trivial.

The main "weak point" is probably that it doesn't have S3 integration, which is entirely fair. But for my purposes, rcloning the library folder (or e.g. rsync to a btrfs for free deduplication if you reorganize) is more than good enough, because that folder provides enough data for it to restore everything I care about.

For DB backups for keeping everything, there are configurable auto-backups, but it's only a snapshot to a local filesystem. So you'd need to mirror that out somehow, but syncthing/rclone/etc exist and there are plenty of options.