3d955e4edd
Ruling 1 (2 weeks of weekly offsite backups): localPruneSpec's blanket PBS refusal is now scoped — an ADDITIONAL tier with an explicit keep_last may prune its PBS target. The refusal still applies in full to the PRIMARY tier, because BackupTarget() defaults to felhom-pbs and KeepLast() defaults to 3, so a box with neither key set would silently prune its offsite DR to 3 restore points. An additional tier cannot have that accident (keep_last defaults to 0). Ruling 3 (first backup runs as long as needed; nothing else starts until done): - additional-tier wait bound 6h -> 12h (measured ~33 MB/min => ~5h for a first full 10 GB snapshot; 12h gives margin but stays bounded so a hung task still surfaces) - ONE BACKUP AT A TIME PER GUEST across all tiers: POST /backup returns 409 when a DIFFERENT tier is in flight, naming the busy tier, with NO data object so nothing is parseable as the caller's own job. Same tier still returns that job (202, unchanged). - snapshotted now counts as in-flight, not just running — after the snapshot the vzdump is still uploading and holding the lock. The old check left a window where a second POST started a real second vzdump. Latent bug, closed. Full suite green (29 packages); red-proof observed and restored.