Author backup-verification harness - per-backup-type integrity (SHA-256 / encrypted-payload signature), restore-to-test-env spot-check cadence, partial-restore (single-table / single-object) verification, cross-region replication validation, retention-policy assertions. "An untested backup is not a backup." Use when a service's backups have never been restore-tested, when the backup tool is being swapped, or when an audit needs proof that backups are integrity-checked and restorable.