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

submitted 1 day 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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[–] swicano@programming.dev 3 points 1 day ago (1 children)

But it feeeeels like a backup, and isn't that what really matters? In my setup I have 3 drives (2x 8Tb, 1x 14 Tb) and I finally have the opportunity to do some consolidation and not just have 3 single drives plugged into a server. Zfs, raid , a dedicated backup drive, but I'm still figuring out what the layout should be.

[–] Doomsider@lemmy.world 3 points 1 day ago* (last edited 1 day ago) (1 children)

Put the two 8tb in a mirrored raid so if one fails you keep your data. Use the 14tb as a backup that is left unplugged for longevity.

That would be my recommendation which is similar to what I have (4 x 6 tb for twelve gigs of redundant storage) and a couple of 8tb drives I keep for occasional (monthly or so) archival backup.

[–] Player2@sopuli.xyz 2 points 1 day ago

I agree. This is also nice because if you need more space in the future you can always add 8TB drives in pairs.