pbs older than the newest snapshot present on sync target

From Google AI:

Proxmox Backup Server (PBS) sync jobs skip snapshots older than the newest one on the target to ensure efficiency, as only newer data is typically needed. This “skipped” message occurs because syncs are designed to be incremental, relying on the target having a cohesive, up-to-date backup chain

• Workaround (New Namespace): To sync older snapshots, sync them into a new, separate namespace on the target datastore.
• Workaround (Temporary Deletion): Temporarily delete the newer snapshots from the target, sync the older ones, then sync the newer ones again.