Backup

Homelab backup strategy: 3-2-1 in practice, not just in theory

Most posts about backup explain the 3-2-1 rule and then show a setup that follows it. I can’t write that post yet. What I can do is go through the rule, hold my own homelab up against it, and show where it falls short today.

The 3-2-1 rule, briefly

Backblaze puts the rule in one sentence: “keep three copies of your data on two different media with one copy off-site” [1]. The three copies include the original, so it is the data you work on plus two more [1]. “Two different media” comes from the time of tape and CDs. Today Backblaze reads it as two different devices [1]. Off-site means a place that a fire, a burglary or a lightning strike at home doesn’t reach.