Backup restoration is the process of recovering systems, applications, and data from backup copies after an incident such as ransomware, accidental deletion, or hardware failure. In security work, the goal is not just to have backups, but to restore from copies that are isolated, immutable, or otherwise protected from the same attack that hit production systems.
It matters because attackers often try to encrypt, corrupt, or delete backups first, knowing that a victim with no recoverable copies faces more pressure to pay or stay offline longer. Defenders reduce this risk by keeping offline or segregated backups, using versioned snapshots, and regularly testing restore procedures. A backup is only useful if it can be restored quickly and cleanly, with systems validated before they return to service.