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@whitequark even for things with no back up, i personally run 15-minutely btrbk btrfs snapshots with decaying retention for earlier files. snapshots like these take minimal time to create and help with being able to create backup in a more consistent state

i will probably switch to zfs for my next computer/drive, whichever comes first, but the principle is the same.

ofc this depends on fs support. i'm not aware if lvm is capable of doing this on a block dev but it sounds sketchy