Fingerprint and skip

Scheduler and shutdown backup can skip backups when nothing changed.

Where it is used

• scheduler.jobs[].skipIfNoChanges (default: true)
• shutdownBackup.skipIfNoChanges (default: true)

How it works

1. ConfigGuard plans the backup:

   • resolves the target into files
   • applies mode and filters

2. A fingerprint is computed from the plan metadata

3. The previous state for the job id is loaded

4. If fingerprint is unchanged and skip is enabled:

   • backup is skipped
   • lastRun timestamp is updated

What counts as a change

The fingerprint depends on planned file metadata.

In practice this reflects: - changes in selected files - changes in file sizes or hashes

This prevents duplicate backups on frequent restarts or scheduler ticks.

Notes

• Scheduler does not catch up missed runs

• Shutdown backup uses a reserved state id:

• shutdown