Preserve the previous state
A backup receives a time, location and verifiable contents before the change. Saying backups are enabled does not prove the latest version is covered.
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Delivery is a chain of evidence, not a launch moment.
A build that passes locally is different from a production change that works and can be safely reversed.
Check the published output
Response status, headers, key routes, forms and static assets are checked at the public address after release.
Separate release from rollback
A rollback plan names which files, database and configuration return, in what order, and how the result is confirmed.
Hand over ownership
Access, domain, repository, data and operating notes need named owners. A handoff without them leaves a hidden dependency.