NAS Backup and the 3-2-1 Rule

RAID keeps a NAS running when a disk fails. Backup brings your data back when everything else goes wrong.

The rule

• 3 copies of your data
• 2 different types of storage
• 1 copy off-site

Why RAID is not backup

RAID handles disk failure only. Deletion, corruption, ransomware and disasters affect every disk at once.

Practical setup

1. Primary data on the NAS.
2. A second copy on another device or external disk.
3. A third copy off-site or in the cloud.
4. Test restores every few months.

Monitor the backup path

Healthy storage and enough free space keep backup jobs working. See capacity monitoring and RAID monitoring.

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