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Raidz2 or btrfs for important document storage?
(piefed.blahaj.zone)
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this post was submitted on 25 May 2026
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For your situation I would be more likely to go with a single drive with btrfs and dup for metadata redundancy. Regular snapshots and scrubs.
Use a second drive in the same system with btrfs to store snapshots at wider scheduled intervals. These will be bigger since no CoW on the separate file system. Scheduled scrub here too.
Use a third drive with ext4 as a backup target using a separate backup mechanism.
Use the fourth drive as a spare, or in a separate location as a target to send the backups if you don't already have an off-site solution.
Interesting idea.