PBS: backup doesn't exist but no backup errors on PVE server

I'm having a problem that might have something to do with write speed at the PBS server, but I'm just guessing.

I have a SATA drive in the PBS server that I do one backup job to. I also swap out USB drives (PBS server offline during swap) and backup an hour later to the USB drive as well.

I don't seem to have a problem with backups written to the PBS sata datastore, but I might lose some or all of the backups to the USB drive. But as far as the PVE server doing the backup is concerned...

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