---
title: "Discussion on \"RAID is not a backup: the 3-2-1 rule, honestly\" | Hashnode"
description: "Discussion on \"RAID is not a backup: the 3-2-1 rule, honestly\". 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 inven"
url: "https://hashnode.com/posts/raid-is-not-a-backup-the-3-2-1-rule-honestly/6ad064751cc59d8b2b1d30dc"
---

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# [RAID is not a backup: the 3-2-1 rule, honestly](https://homelabtherightway.hashnode.dev/raid-is-not-a-backup-the-3-2-1-rule-honestly?utm_source=hashnode&utm_medium=feed)

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 inven

Oct 15 · 5 min read · homelabtherightway.hashnode.dev  
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## Written by

[Charles Hartmann](https://hashnode.com/@charleshartmann)

@charleshartmann · New York, USA

  
[View profile](https://hashnode.com/@charleshartmann)

Homelab the Right Way: Proxmox, OPNsense, Home Assistant, backups and Android apps.

I run Proxmox, OPNsense and Home Assistant at home and write about doing it the right way: backups that restore, networks that are locked down, automations that just work. I also ship Android apps on Google Play as Hartmann Studios. Articles here are cross-posts from my blog (canonical links point there), drafted with AI help and edited by me.

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