plakar's pkg backend deletes an installed ptar when its cache
re-extraction fails (observed 2026-08-24: orphaned .incus-* temps,
final ptar unlinked, 'unsupported importer protocol'). Reinstall from
the kept ptar before backing up instead of failing the night.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Thin wrapper chained after incus-copy in the same cron entry: backs
up the incus source (quiesced backup-project replicas via the plakar
incus integration) into @s3incus, prune + maintenance.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>