Failback is another data migration

Treat the active recovery region as authoritative

Record the point at which it began accepting writes and the operations performed since then. Protect that history while preparing the original region.

Do not let restored connectivity cause old workers to resume against stale data. Keep the former primary fenced under the platform's supported procedure.

Decide whether to rebuild, resynchronise or replace its data according to the database's capabilities and the incident state.

Verify the return destination

Restore required capacity, configuration, identity and integration access. Confirm that the release and schema are compatible with the current authoritative data.

Check the original cause of failure has been resolved. A successful infrastructure health check may not establish that the application dependency or configuration problem is gone.

Run safe checks before moving authority. Preserve isolation from live effects where the destination is not yet active.

Plan the final data transition

Use the supported replication and promotion model to bring the destination current. Establish how writes are paused or coordinated and how the final checkpoint is verified.

Include queued work and external callbacks. They should not be released independently into both environments during the transition.

Define the recovery action if the return fails after new writes begin. The same authority problem that applied during initial failover applies again here.

Return under a measured window

Choose a suitable time, name the decision owner and run the controlled sequence. Verify the normal user path and important background workflows after routing changes.

Monitor for duplicate or delayed operations and reconcile the incident's unresolved work. Keep the previous active region available only according to the revised recovery policy.

Update the runbook with what the return actually required. A failover drill that never tests failback leaves the team with only half of the operating procedure, especially when the service must eventually return to its original region.

Carry a known record across the return

Create an identifiable synthetic case while the recovery region is active, update it and attach a test file. After failback, verify all three through the ordinary application. This checks more than the database's main table and exposes an object-storage route that still points at the previous active location. Retain the operation identities in the exercise evidence so a duplicate, missing update or stale attachment can be traced to the relevant phase.