That wasn’t bad, and it’s nice to know some of the history even if it’s hard to find a trail right to an issue.
For long to read, here are two others (why a flurry now?) of this error from complicated network failures:
Unexpected difference in fileset version(s)
Error: The socket has been shut down
I’ll leave it to you if you want to look for a way to copy your destination. Is there maybe a web interface?
The database bug report might be the next step (if database is current). I hope someone else can study these eventually, maybe using the heavily-illustrated first of the just-above links as a possible approach.
A copy of the text from About → Show log → Stored is also helpful, as job log is sometimes not created, especially when things don’t complete (which is when you’d like a log). This reporting is being improved.