Amazon Cloud Drive - Web UI Hangs on 'Test connection'

[JonMikelV]

There are a number of log files as well as a few in the GUI itself. This post mentions where you can find them with Windows path examples, does that help you find them in Linux?

Where does Duplicati keep its log files?

There are a number of logs. The general logs are stored in %LOCALAPPDATA%Duplicati\Duplicati-server.sqlite. The “per-backup” logs are stored in the local database (you can get the path from the “Database” menu. Then there is a crash log in %LOCALAPPDATA%Duplicati\crashlog.txt. And you can also have a log file set with --log-file=C:\logfile.txt.

As far as your error (which I edited by adding ~ tildas before and after), it seems to be saying your authentication for ACD is incorrect so you might need to edit you backup job and redo step 2 (Destination).