Protect Credential Backups
Map secret copies in backups and restore paths, then test access, retention, and use of retired credentials after recovery.
A rotated credential can remain in a database backup, container image, or machine snapshot. That copy may not work after provider-side revocation, but it can still reveal other data or become active if an old environment is restored. Backup protection is part of the credential lifecycle, not a separate storage problem.
Inventory the systems that can capture secret material: database snapshots, secret-manager exports, CI caches, device backups, and disaster-recovery images. Record the owner, encryption, access path, retention, and restore procedure. OWASP's secrets guidance calls for controlled storage and lifecycle management. Do not open personal backups or unrelated systems without authorization.
Backup exposure map
| Copy class | Access control | Retirement question |
|---|---|---|
| Database snapshot | Recovery role | Does it contain recoverable API keys? |
| Secret-store backup | Separate custodian | Can a revoked version be restored? |
| Container image | Registry readers | Was a key baked into a layer? |
| CI cache | Workflow trust boundary | Can untrusted jobs read it? |
| Developer backup | Device owner | Is it in approved retention scope? |
Avoid storing raw keys in the map. Use safe IDs and location classes. A backup that cannot be selectively edited may need retention controls and provider-side revocation rather than a risky manual rewrite. Document the limits honestly.
Restore drill
In an owned test environment, rotate a synthetic credential and take a backup. Restore an older snapshot into an isolated environment with no production egress. Verify the old credential cannot reach the provider after revocation and that the restored app does not overwrite the current secret configuration. Check who can request and approve the restore.
Record the backup version, restore environment, provider status, and cleanup result. If a real credential was embedded in a public image, treat it as exposed and revoke it. Do not claim deletion from all backups unless the retention path is verified. A clean current database does not prove historic copies are gone, and a retired key's provider-side rejection is still the main control against reuse.
Make offboarding verifiable
Use the offboarding checklist to identify owners, revoke grants and verify the result. Discuss a scoped review of your application's access controls.