Clean backups are backup copies that defenders trust for recovery after a cyberattack. “Clean” means the data was taken before compromise, stored in a way that attackers could not easily alter, and verified before restoration. In practice, this often requires offline or isolated backup systems, strong access controls, and regular restore tests.
They matter because ransomware and destructive malware often target backups first. If backups are encrypted, deleted, or secretly contaminated, recovery can reintroduce the intrusion or fail entirely. Clean backups give organizations a known-good path back to service, helping reduce downtime and limit pressure to pay attackers. They are also part of incident response: teams must preserve evidence and check whether the original environment was fully remediated before restoring systems. Clean backups improve resilience, but they do not prove no data was stolen; they only help restore trusted operations.