thanks for your reply.
I did steps 1 and 2. When I started the game all presets were gone, espcially the at-st bug. Then I started single player as expected, played till auto save and completed step 4 and 5.
There was no promt to use local save files again. The bug and all my presets are gone. So kinda problem solved!
Do I have to worry about my cloud backup?
