My full-system backups are done with btrfs snapshots synced to an external disk (actually two disks to have two backup locations). It's nice because you can kee

My full-system backups are done with btrfs snapshots synced to an external disk (actually two disks to have two backup locations). It's nice because you can keep the snapshot on your system and don't need the external disk as long as you have enough space, and both filesystems are in almost exactly the same state which makes it easy to mount it for copying a single file or to even boot your system from the external disk.