Using duplicati-cli I get the same results that you do. I notice that the command line only has “–exclude” while the UI has “Exclude folder” and “Exclude expression”. Perhaps there’s a difference here?
In the end what I’m trying to accomplish is having duplicati not backup it’s local database because that’s causing an exception as well saying something about issue 1400. See this post New backup state Error: Checking errors, related to #1400