What is a valid method of verifying a backup of critical files?

Verifying a backup of critical files ensures that the data recovery process will function effectively when needed. Restoring one of the files from the backup is a practical and direct method of validation. By successfully retrieving a specific file, you can confirm that the backup contains the accurate and complete information necessary for restoration. This hands-on approach demonstrates not only that the data is intact but also that the restoration process itself is functioning correctly.

Other methods, while useful, do not provide the same level of assurance. Checking the storage medium for errors can identify physical issues with the medium but does not guarantee the integrity of the backed-up data itself. A success report from backup software indicates that the backup process was completed without errors, but it does not confirm the usability or integrity of the files. Creating multiple copies of files is a form of redundancy, which may help prevent data loss, but it does not verify the accuracy or completeness of any one backup.