Verify backup bytes before applying restored data
A truncated object archive is discovered only after the application starts.
- Focused work estimate
- 2h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Integrity · Archive handling
Estimated field mix
- Storage systems70%
- Site reliability30%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional reporting service has successful backup jobs but no recent restore rehearsal. Database rows reference objects with different retention schedules.
Setup prerequisites
- Create disposable local database and object-store fixtures with synthetic reports; author backup and corruption examples.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Validate declared sizes and content digests.
- Reject missing or extra required archive members.
- Stop before promotion on any mismatch.
Implementation constraints
- Bound archive expansion and reject traversal paths.
Verification to include
- Verify a complete backup set.
- Reject corruption and an escaping archive entry.
Deliverables
- Backup integrity verifier.
Rollout and recovery
Keep failed restores isolated and retain diagnostic metadata.
Value of the work
For the engineer: Practice recovery consistency, integrity validation, and honest recovery objectives.
For the team: Replace backup-job optimism with a repeatable restoration assessment.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.