I uninstalled Duplicacy after I found I couldn’t do WebDAV from the GUI. After the uninstall I restarted Windows and the Duplicacy process was still running and visible in Task Manager.
How do I completely uninstall Duplicacy?
You can kill the process in Task Manager and then delete the entire directory C:\Users\username\AppData\Local\Duplicacy (or C:\Program Files (x86)\Duplicacy if you installed Duplicacy for all users).