@Flamekebab @non_burglar Sounds like snapraid might be a better fit for your needs. Since it runs over top of the filesystem, if you lose a disk you can still access files from the other disk(s). It's better than rsync, in that it would provide regular data validation ('snapraid scrub' once per week or so). It is more designed to work in raid5 rather than mirroring (raid1) setup, however.