RAID is not a backup: the 3-2-1 rule, honestly (chartmann1590.github.io)

submitted 1 week ago by homelabtherightway@lemmy.world to c/homelab@lemmy.ml

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What actually counts as a copy under the 3-2-1 rule, why a RAID mirror or a snapshot only protects against one kind of failure, and the one-page inventory that exposes the gaps.

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Disclosure: this is my own article (Charles Hartmann, Homelab the Right Way). Written with AI help and edited by me; the setup described is mine.

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[-] homelabtherightway@lemmy.world 1 points 6 days ago

Ha, it absolutely feels like one, right up until a bad sync or a fat-fingered rm hits every disk at once. With 2x8 TB plus a 14 TB, one layout people often land on is mirroring the two 8s (ZFS mirror) for live data and using the 14 TB as a separate backup target (snapshots replicated to it), plus something offsite for the stuff you can't lose. That gets you redundancy and an actual backup out of the same three drives.

this post was submitted on 22 Oct 2026

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