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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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While redundancy in a drive setup helps, it’s not really a backup and thus not a “safe” way to store important information on it’s own.
That said, selecting the way you setup a raid system is based on risk and utility. I have a raid1 with a hotspare for important files. And use raid5 with 3&4 drives for less important stuff. You can also optimise for reading speed for example (as the same file can be drawn from multiple drives)
Like you said: RAID is not a backup. If it's import follow at least the 3-2-1 rule. 3 copies on at least 2 different media, 1 of them off site.
Absolutely, 4-3-2 is what I use now! MDisc backups have been great.