What else (if anything) is running in terms of Duplicati (e.g. run ps), and (if Duplicati) Duplicati jobs?
Is that command line an Export As Command-line of a job there, or created in some other manner?
Single Duplicati has few ways to trip on itself, but multiple Duplicati can definitely collide in a job DB.
While awaiting the clarification for the database situation, I’ll suggest just testing for an OAuth issue.
mono /opt/duplicati/Duplicati.CommandLine.BackendTool.exe list "googledrive://Docker?authid=<<authID removed from here>>"
Thanks for all the help. I finally realized that it has to be something configured incorrectly on the Synology NAS device, as this works fine when run from Docker elsewhere. Given that I’m going to get a new device next year (this one is five years old) and the Synology itself has built-in backup to Google Drive, I’m going to stop wasting your time on this until I get a clean, new, NAS device. Just not worth you’re taking all this time when I’m pretty sure it’s a problem here, not with Duplicati (which works just perfectly backing up from one NAS to another, which is how I ended up setting it up). Thanks again, and hopefully, with a new NAS, Duplicati/Docker will work great. Back next year… Thanks!