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What does the 3-2-1 rule look like for you? (lemm.ee)

submitted 3 days ago by [email protected] to c/selfhosted

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I'm trying to plan a better backup solution for my home server. Right now I'm using Duplicati to back up my 3 external drives, but the backup is staying on-site and on the same kind of media as the original. So, what does your backup setup and workflow look like? Discs at a friend's house? Cloud backup at a commercial provider? Magnetic tape in an underground bunker?

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[–] tburkhol 1 points 3 days ago

3: RAID-1 pair + manual periodic sync to an external HD, roughly monthly. Databases synced to cloud.

2: external HD is unplugged when not syncing

1: External HD is a rotating pair, swapped in a bank box, roughly quarterly. Bank box costs $45/year.

If the RAID crashes, I lose at most a month. If the house burns down, I lose at most 3 months. Ransomware, unless it's really stealthy, I lose 3 months. If I had ongoing development projects, a month (or 3) would be a lot to lose, and I'd probably switch to weekly syncs and monthly swaps, but for what I actually do - media files, financial and smart-home data, 3 months would not be impossible to recreate.

All of this works because my system is small enough to fit on one HDD. A 3-2-1 system for tens of TB starts to look a lot like an enterprise system.