Feedback from a new user - mainly Windows use

I am hitting a wall here on the LAN backup. I’m stuck in an all Windows environment. Need to run Duplicati “As a service” so it will backup locked files (mailstores). But this means no LAN access.

I tried doing the “map a network drive” method, but that destination can’t be seen by the Duplicati service either.

I was thinking of installing NFS on the destination machine - but am then at a bit of a loss as to how to address that from the Duplicati client.

I seem to have run out of options for “simple LAN backup”. Will try a few more options today and add findings to this thread. Been too long since I messed around with user accounts and rights on Windows.