ts678 has a great post here of other posts around here that go into quite well (the 2nd one even has photos of it if you use the expand arrow in that post): How can i make scheduler make backup at start system? - #3 by ts678
I don’t think anyone would go into that in depth when its been asked previously.
Edit: Although, I don’t think anyone has gone well into duplicati client use specifically so that might be something here.
Also if “not logged in” is a duplicati client incorrect config thing then it goes into how to use that here such as if you didn’t log in correctly (and the token is expired which is what shows that error message there): GitHub - Pectojin/duplicati-client: A command line client for controlling the Duplicati Server