Calibre-Web: Transferring User Profiles/Settings

I am trying to setup a backup version of Calibre-Web on my Linux Mint PC.

My original is setup on my QNAP NAS.

What I need to do is somehow transfer all the user profiles and settings (passwords as well) from the NAS to the PC.

It seemed that the app.db file was a simple answer, but for some reason none of the users show up; only the admin user when I run it on the PC.

My book database (setup during install) comes up ok as I have a PC copy that is the same as is on the NAS, so the books themselves are not a problem, only transferring the accounts.

Any ideas?

Thanks,

Monty