Immutable Backup Readiness Checklist

What ‘Immutable’ Really Means

Immutable backup cannot be deleted or changed even by an attacker – and is only real when access is protected by different roles, WORM lock is enabled, and restore is regularly tested.

  • Use distinct admin identities for each tier secured by phishing-resistant MFA.
  • Object-lock/WORM that can’t be shortened under pressure.
  • Conduct quarterly test-restores confirming last-clean dates.
What ‘Immutable’ Really Means

Design for Speed and Distance

Different layers are required for various tasks. Local storage ensures speed, immutable NAS provides security, and cloud storage covers distance. This confirms each is set up to withstand both attacks and human mistakes.

  • Verified throughput of the local fast‑restore tier during heavy usage.
  • Immutable NAS/file system featuring deletion safeguards.
  • Cloud-based object storage offering cross‑region replication and legal holds.
Design for Speed and Distance

Frequently Asked Questions

Immutable backup cannot be deleted, modified, or encrypted – neither by ransomware, nor by any internal mistake. WORM lock role-based access restore tests – then it is truly immutable. 

3 signals should be checked:

WORM/Object Lock active

Delete/modify rights restricted and role separation 

Periodic restore testing documented 

If these 3 are missing, the backup is at risk. 

Because making backup safe is one thing, making restore work is a different thing. If the restore fails, the backup has no value. Quarterly restore drills are included in the checklist. 

Does not stop Ransomware; it minimizes the impact. Even if there is an attack, you can get a fast, clean recovery from backup – without paying ransom.