After switching to new PC (and in addition switch from S1v5 artist to S1v6 Prof) I lost all my external device settings.
Copying the User Devices and Surface Data[1] folders from the setting folder (old PC) to the new computer when Studio One isn't running does not work.
It is a lot of work to add all devices and do midi learn for every fader, knob or button again.
So: an import / export possibility would be good idea.