Restore Points

Backup Is a Copy

A restore begins from the saved snapshot copy.

highlighted = computed this step

Backup is a copy

A backup snapshot is the starting copy. At the backup point, no later log record has been replayed.

snapshot copy\text{snapshot copy}

Show the copy

The diagram shows 2 saved items and 0 applied log records.

saved items=2\text{saved items}=2

Backup and restore-point examples are tiny finite replay models; cloud products, backup strategy, RPO/RTO, encryption, compliance, performance, and runbooks are out of scope.

Backup is a copy: backup snapshotBackup is a copy: backup snapshotitemvalueA10B20 log after backuplog after backuppositemvalue1A112B253A13 restore point factsrestore point factsfactvaluetarget0appliedCount0skippedCount3changedCount0targetIsBackupyestargetInLogno applied log recordsapplied log recordspositemvaluenonenonenone skipped log recordsskipped log recordspositemvalue1A112B253A13 restored staterestored stateitemvalueA10B20 changed itemschanged itemsitembeforeafternonenonenone

Read the restored state

The restored state still matches the snapshot because the target is the backup point.

restore starts from copy\text{restore starts from copy}

Summary

This model is only a tiny copy plus replay example, not a backup strategy.

copy first\text{copy first}