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The guest-level backup layer + the journaled self-restore-test (restore→boot→verify→ teardown) that closes "a backup you haven't restored isn't a backup". All benign (reuses the slice-4 classifier/gate/journal; no new destructive class/crypto). Local target only; PBS = Phase B. Restore to a NEW guest only. Backups crash-consistent. - proxmox: DestroyLXC, VzdumpOptions.Notes (notes-template), LatestBackupVolID. - reconcile: Engine.RunRestoreTest (journal Scratch entry BEFORE mutation; net link-down pre-boot; defer teardown always; benign gated destroy) + Recover extended to reap a leaked scratch guest (Scratch flag, special-cased before the UPID path; idempotent). - internal/backup: runner (vzdump + archive resolve + bulk-gap = backup!=1) + cadence scheduler (4th daemon goroutine, default 24h) + in-memory report store. - hub: Backup/RestoreTest filled; collector seams; cross-repo golden byte-identical + bidirectional key-set tests; hub handler logs a FAILED restore-test prominently. - config BackupConfig (band 990000-990009 default); --selftest=backup / restore-test. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>