Hi @JimL243 , welcome to the forum!
Can you provide a few more details such as:
what version of Duplicati are you running?
to what destination are you backing up?
what was happening when the error occurred
That last item is basically asking if you were doing something like cancelling an in-process job which MIGHT have been the cause of a similar stream does not support concurrent IO read or write operations error mentioned here:
Today I had another backup job to Anazon Cloud Drive fail. This time, at least the reason was logged (I double checked the logs for the one from 30 nov in the screenshot above but there is definitely nothing logged at 15:40). In fact, I suppose this failure went quite smoothely, since the backup job quit with an error message and started the next backup as scheduled. I suppose this is how it’s supposed to work.
Nevertheless, I think duplicati should be able to handle this situation better, i.e.…