Backups are only valuable if they can be successfully restored when needed. Testing backups on a periodic basis is the only reliable way to validate their viability. Simply storing backups without testing may create a false sense of security, because corruption, misconfiguration, or incomplete backup sets can go unnoticed until a disaster occurs.

Industry best practices, such as those recommended by NIST and ISO 27031, emphasize regular backup testing as part of disaster recovery and business continuity planning. Testing involves restoring data to a test environment, verifying its integrity, and ensuring that applications can use the restored data as expected.

Deleting, comparing, or replacing backups might help in managing storage efficiency, but these actions do not confirm whether the backups are usable. Periodic testing ensures alignment with company policy, regulatory requirements, and internal risk management controls. It also provides confidence to management that recovery objectives, such as RTO (Recovery Time Objective) and RPO (Recovery Point Objective), can be met.