Immutability (Immutable Backups)
Immutability prevents backups from being modified or deleted for a retention period.
Updated: 2026-03-05
Definition
Immutable backups are protected so they cannot be altered or deleted for a defined period (WORM).
This helps defend against ransomware that targets backup repositories.
Key points
- WORM retention prevents deletion/modification
- Reduces ransomware impact
- Combine with offsite backups
Common mistakes
- Setting retention too short.
- Admin accounts can still override immutability if not controlled.
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