The preventive counterpart to host_disk + storage_fill detectors: the periodic local
whole-guest vzdump now prunes its own old archives (keep-last=3, clamped >=1) so a box
can't refill its own root via its own backups. Local target only — PBS never pruned
(resolved via ListStorage; fail-safe skip on unknown). Seeded in host-install.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HxLA1mZurFq9kt8hneFeCs
BackupRunner.BackupWithSnapshotHook tails the task log for the 'create storage
snapshot' marker (snapshot mode only) and fires onSnapshot once; localapi flips
/backup/status to 'snapshotted' before 'done' so the controller resumes early.
Phase 0 validated on PVE 9.2.2: marker confirmed, downtime ~24s->~1s (934MB).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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