Direct answer
A backup is useful only if the required data can be restored. Choose representative files and a safe destination, perform an authorized restore and verify content, permissions and the time required.
Define recovery requirements
Identify the device owner, important data locations, backup system, expected recovery point and acceptable downtime. Include data outside common synchronized folders and record exclusions. A cloud synchronization service and a versioned backup may provide different recovery capabilities.
Run a safe restore
Use non-sensitive representative fixtures or approved files and restore to an isolated test location. Check that the selected backup version exists, the recovery operator can access it and the files open correctly. Never overwrite a user's working copy without explicit coordination.
Reference: NIST: Data integrity and recovery.
Record gaps and retest
Measure actual recovery time, compare restored files and access with requirements, and document failed or missing items. Assign an owner for each gap and test again after changes. Ensure recovery credentials and encryption keys are stored separately under the approved access process.
Test a second recovery point
If a file was damaged several days before the latest backup, a single current restore may reproduce the damage. Where the backup product supports historical versions, choose a second approved recovery point and compare the content. Record the recovered version and timestamps without overwriting the user's production copy.
Assessment limits
A successful sample restore does not establish that every endpoint or file is protected. Recovery also depends on service availability, credentials, backup age and the incident affecting the original data.
Frequently asked questions
Does a successful backup job prove a restore works?
No. Perform a representative restore and verify the recovered data.
Should a test overwrite existing files?
Use a safe separate location unless the owner has explicitly approved a different method.
Does drive encryption replace backups?
No. Encryption protects data at rest; a backup supports recovery from loss or damage.
Primary sources and further reading
These guides combine published security guidance with practical assessment planning. Adapt checks to the owner's policy, environment, and authorized scope.
This guide was prepared with AI assistance using the linked sources and illustrative examples. Check current vendor guidance and your environment before making changes.