Thanks for pointing out the --daemon option, however the documentation (i.e. man rclone) does not describe very well what that option actually does. Is there a more complete description somewhere else?
Is it simply that rclone sets itself up to be disowned, not use stdout nor stderr, then fork()s* (with parent process exiting) to run as an independent process? (If so, I guess I should use the systemd [Service] unit option Type=forking - right?
*Or whatever equivalent rclone uses on Windows® to do a similar action...