One. Unmutable Backup., or immutable backup, protects a point from.Documentation. against modification or deletion during its period of.Retention.. This immutability completes the separation of accesses, offline copies and restoration tests; it does not replace them.
Simple definition
An immutable backup cannot be modified or deleted for a defined period.
Technical definition
The immutability is based on storage, filesystem or object-lock mechanisms that prevent early deletions.
What is it used for?
Protect backups against ransomware and malicious removal.
Concrete example
aFree keeps the restoration points 14 days without the possibility of clearing them.
How to diagnose Immutable backup?.
Check where the immutability is actually imposed:Doughened free, Object Lock, WARM or equivalent mechanism. Retention., accounts capable of modifying it and what happens when the capacity reaches saturation. A « immutable » announced backup must retain this property even if the main backup server or its identifiers are compromised according to the expected threat model.
Common problems
Unmutable does not automatically mean offline or off-site. A single control plan, same holder or too powerful identifiers can still create a failure point. Unsized retention can also block the release of,space. It is therefore necessary to articulate immutability, administrative separation, capacity, encryption and policy 32-1-1-0.
How to validate the correction — Immutable backup.
Try a restore regularly from a still locked point and measure the time needed to restart a critical system. Simulate the loss of the backup server: copies must remain discoverable and re-storeable.Monitor suppression attempts, retention changes and the approach saturation before they become an emergency.
FAQ — Immutable backup.
Is an immutable backup impossible to remove forever?.
No. It is protected for a retention period defined by technology and policy.
Is it the same as an airway?.
No. An airway aims at isolation; the immutability prevents modification for a period.
What test is indispensable?
A real restoration from an immutable point, including in a scenario where the main backup server is unavailable.