Keep getting System.AggregateException and System.IO.FileNotFoundException. Need help

Answered at least tentatively (before issue reverted to unsolved) in the topic I linked.

I can’t do Docker specifics, but I did click on the links and they still appear to say what the post said.

Configurations are in Duplicati-server.sqlite which is usually right next to the per-backup files.
Getting everything that you need onto the host, if possible, would save you some redoing of things…
I’m not sure where your browser is, but it can export configurations to files (keep for safety anyway).

I’m not sure about that one, but some of the UI takes awhile to populate data. System info is that way.
Sometimes fields will say something like “Unknown” for things that aren’t yet known from server data.

That makes sense because the 300 GB finished, while the 3 TB hasn’t finished even its initial backup.

I can’t find an error message like that, even loosening and using a regular expression. Can you quote?