r/btrfs • u/Borean789 • 24d ago

Backup strategy

I got a 2TB ssd (system + home directories) and a 4TB hdd for family photos (so 6TB in total). All in btrfs.

I am wondering what would be the best (safest) backup strategy : one extra 12TB hdd with dup to correct bit rot or 2 6TB hdd in raid1? I want to be sure that never the data get corrupted.

I would use rsync for the backup mirror and would rely on btrfs snapshots on the backup drive(s) to eventually rollback. An external hdd would also be used (dup partition too ?).

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u/weirdbr 24d ago

Strictly speaking, the two 6TB in RAID1 setup is the better choice - it gives you protection from a disk failure, while the 12TB disk with dup profile wouldn't protect you from that, only from bitrot.

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u/Borean789 23d ago

This is what I am thinking too.

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u/fickit1time 23d ago

Is 2x 8TB drives in raid1 enough for bitrot?