Looks like I’m going to have to start a new bug report, because the exit codes do not work as expected. Thank you for the exit code list, I didn’t know that Duplicati already supported different error codes. When I wrote my scripts (examples in the original post) I simply used “0” for “OK” and “1” for “error”. After looking at your link, my interpretation is that error code 1 should be “OK, don’t run operation” however what I get from Duplicati is a big red cross and an error reported by the GUI and logs. The logs show “error code 1” is being reported, so the problem does seem to be with how Duplicati processes the error code.
As for recreating the original problem. I would be happy to do that and can post the debugging information, either here or in a new thread or bug report. Cheers.