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Security Operations · Intermediate

Immutable Backup

A backup that cannot be modified or deleted for a defined retention period, even by administrators.

Definition

Immutability is implemented with WORM storage, object lock (such as Amazon S3 Object Lock in compliance mode) or hardened backup repositories. It prevents ransomware operators who gain admin access from destroying backups. Air-gapped backups provide similar protection through physical or logical separation.

Example

S3 Object Lock in compliance mode retaining backups for 30 days so no account can delete them.

Exam tip

Immutable or offline backups are the best answer for ransomware resilience.

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