Migrating from User to Service install on Windows is a more step-by-step guide, however it’s somewhat old, and doesn’t yet worry about Duplicati Access Password setup. Ideally, you’ve already set up a password which you can use for direct URL, e.g. http://localhost:8200.
Kills aren’t the nice way, but are usually safe when idle.
Nice is right-click and Quit, if you can find TrayIcon, probably in lower right of screen, but probably in the expansion area unless you moved it (so click the up-arrow/caret icon to the left of the clock).
Probably the easiest path (of several) is above that:
It is possible to pick a different location for the database with the commandline option
--server-datafolder=<path>
and it means commandline as opposed to GUI, so you would put above option into the step
The registration of the Windows Service is done by executing the WindowsService binary:
Duplicati.WindowsService.exe INSTALL [arguments ...]
The arguments can be any of the arguments supported by the Server and will be passed on to the Server on startup.
so instead of plain install as above, you’d customize it, e.g. with a --server-datafolder option.
How to Start, Stop, and Restart Services in Windows 10 & 11 may come in handy at some point.
If you also need a TrayIcon attached to the Windows service, it’s possible, but more steps to run.