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IT continuityCyber resilience
Backup
In French : Sauvegarde
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.
Source : DORA art. 12 / CIS Controls v8.1, contrôle 11
Related terms
Recovery point objective
The volume of data, expressed in time, that the organisation accepts losing during a disruption. A four-hour RPO means the last four hours of input may be lost.
Immutable backup
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.