Backup Restore Drill: Proving a Recoverable Trading Stack

Choose a scenario with a real boundary

Describe the failure being tested: a lost database host, an unavailable region or corruption discovered after several backups. The scenario determines which recovery copy is appropriate. Selecting the newest copy without checking the incident time can reproduce corrupted data instead of recovering from it.

Record backup identifiers, timestamps, encryption-key access, software versions, configuration dependencies and the person authorized to release the material. AWS recommends exercising disaster recovery arrangements rather than assuming the plan will work. A drill should include the actual handoffs needed to obtain access, not a shortcut that only the test author can perform.

Restore safely and verify the recovery chain

Keep the restored environment away from live payment endpoints, production order routing and customer notifications. A restored scheduler or queue consumer can otherwise repeat real actions. Use isolated credentials, explicit destination controls and a documented way to inspect pending work without executing it.

For PostgreSQL point-in-time recovery, a valid base backup and a continuous sequence of required write-ahead log files are central dependencies. Document the chosen recovery target and observed completion point. A database accepting connections is only the first technical check; verify tables, permissions, configuration and the application's ability to read representative records.

Reconcile before declaring the drill passed

Select business invariants appropriate to the scope: opening balances plus movements equal closing balances, unique external events produce one booking, and unresolved instructions remain identifiable. Compare recovered internal records with a controlled snapshot or approved external evidence. Keep missing and duplicated items in an exception list with an owner.

Track time spent waiting for people or secrets separately from restore execution and data validation. A slow approval handoff can dominate recovery even when the database is fast. Close the exercise with pass, conditional pass or fail against criteria written beforehand, plus a retest plan for defects. Do not relabel an incomplete exercise as successful because the server started.

Example: a restored queue still needs review

A fictional drill restores a 14:00 snapshot. A payment accepted externally at 14:02 is absent, while a 13:59 queued notification appears pending again. The drill team leaves outbound integrations disabled, verifies the payment with its stable provider reference and records how reconciliation would restore the missing booking. It also confirms that replaying the notification would not create another financial entry. The test ends only after both exceptions have evidence.