I use OneDrive as a backup destination and recently had to upgrade the protocol. I had been receiving the 410 (Gone) error. It now works fine, EXCEPT for the following error, which I am getting constantly:
2019-01-19 14:32:56 -05 - [Error-Duplicati.Library.Main.Operation.TestHandler-FailedToProcessFile]: Failed to process file duplicati-b50cd61d415fe4bcc932171d549ce12d7.dblock.zip.aes
The file name that fails is NOT always the same.
I am not sure if this is related to the change in protocol but I think it is because I also use a network drive as a destination and that backup schedule seems to be working well, without errors.