A backup is useful only if it can support a recovery you understand. Define what must be recovered, protect the stored copy and test restoration in an isolated environment.
Describe the recovery requirement
Decide which data, configuration and related files are required to operate the application again. A database dump may not contain uploaded images or private environment settings. Distinguish how much recent change could be lost from how long restoration may take; these are different recovery requirements.
Create a consistent and protected copy
Use a backup method suitable for the database and workload. Consistency across related tables matters, especially while writes continue. Protect credentials, restrict access to backup files and keep copies outside the public website directory. A checksum can detect a changed file, but it does not by itself prove that the data can be restored correctly.
Restore and verify in isolation
Restore into a separate environment, then check row counts, representative content, permissions and important application workflows. Record the procedure and the observed result. Never replace a live database with an older snapshot merely to test whether the backup opens; current users may have created valid data since the snapshot.
Worked example
A fictional recovery rehearsal compares three things: the backup archive passes its integrity check, the restored database contains the expected records, and a separate application instance can read them. Each check adds evidence; none alone establishes that every dependency of production has been recovered.
Check your understanding
Try each question before opening its explanation. These are free practice prompts; they do not use game chances.
Is a checksum the same as a restore test?
No. A checksum checks file identity or integrity against an expected value. A restore test checks whether the backup can reconstruct usable data and support the required workflow.
Why restore to a separate database?
It avoids overwriting current production records and lets you investigate compatibility, missing files and configuration before planning a real recovery.
What belongs in a recovery runbook?
Include the backup location, access method, required software, restoration steps, verification checks and the decision process for a real incident. Keep actual credentials in a protected system rather than in the document.
Sources and further reading
These original examples explain foundational concepts. Use the official references for complete, current details and version-specific behaviour.
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