When I am coping database files to PC where restoration needs to be done, should I overwrite “Duplicati-server.sqlite” that is created after Duplicati installation of keep it? gave some information. Was it enough?
Doing everything from the Duplicati GUI is probably not possible, but Windows also has GUI File Explorer. Suggestions for a GUI to move cloud to local backups (is that what you’re seeking?) depend on the cloud, however backups are portable and you just need to adjust the backup jobs to refer to the new destination.
What pieces do you still need?