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Timeshift creates a btrfs snapshot on each boot for me. And my server gets nightly borg backups.
Just a friendly reminder that BTRFS snapshots are not backups.
You're correct and probably the person you're responding to is treating one as an alternative as another.
However, theoretically filesystem snapshotting can be used to enable backups, because they permit for an instantaneous, consistent view of a filesystem. I don't know if there are backup systems that do this with btrfs today, but this would involve taking a snapshot and then having the backup system backing up the snapshot rather than the live view of the filesystem.
Otherwise, stuff like drive images and database files that are being written to while being backed up can just have a corrupted, inconsistent file in the backup.
Absolutely, my backup solution is actually based on BTRFS snapshots. I use btrbk (already mentioned in another reply) to take the snapshots and copy them to another drive. Then a nightly restic job backs up the latest snapshot to B2.