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IT continuityCyber resilience
Immutable backup
In French : Sauvegarde immuable
A backup that cannot be altered or deleted for a defined period, even by an administrator. It is the only genuinely effective protection against ransomware that compromises the directory.
Source : DORA art. 12 / CIS Controls v8.1
Related terms
Backup
A copy of data held separately to enable restoration. The 3-2-1-1-0 rule summarises good practice: three copies, two media, one off-site, one immutable, zero verified restore errors.
Ransomware
Malware that encrypts or exfiltrates data for extortion. It is today the reference scenario for most continuity exercises.