I have read a few posts and answer but I am not quite sure...
I was on Catalina and for multiple compatibility reasons, I need to go back on Mojave. I did a time machine back up on Catalina, erased the startup disk and Mojave (which my Mac was shipped with) is now installing. What is going to happen when I restore from my Catalina time machine backup?
I don't want the OS restored. I want everything I had on Catalina switched to Mojave.