I confirm that with beta number of parallel works to compute by the server for each saved file set to 1 and beta number of parallel works to compute on the server for the same saved file set to 1 the issue is gone.
I was close as I had seen a comment stating a fix like this one in Server 2.5.22/Client 2.5.16 - #12 by Bleo File backups are failing when Beta: Number of parallel file* are set to anything more than 1
, |WARNING |Not all folder metadata could be applied. Metadata was inconsistent.|
but the error message pasted was only the last error, he asked for help, and there were no followups to this clue. Though I only found it a few weeks ago. Hard to tell if I had been able to nail this issue with just my previous finding (and it was a short hint in a lot of notes). In fact, checking, I found this hint the day I opened this thread!
Thanks a lot. I only have one client left to test, but all other four succeeded reproducibly a few times already.