10.13.6 Clover and 11.2.2 OpenCore aside?

I am preparing a Big Sur installation with OpenCore. I do this using my 10.13.6 Clover setup. Now, finally arriving at the point of installation, i wonder what will happen on the next boot attempt, when I install Big Sur on a drive 2, while keeping my clover installation on drive 1? Any ideas? Will I ever be able to get into my computer?

I also wonder what will happen my Windows installation that I can easily select in the Clover Boot loader? I googled but could not find any infos regarding that situation.

Any ideas? Any tips? ...anything?

Thank you!