Usualy one gets only one quicksave, so BG3 is already more generous in that regard than I am used to.
You can set in the options how many auto and quick saves the game will keep before overriding. Manual saves stay forever. So if you want to keep a save make a manual save. (esc =>Save=>new save). I would find it really annoying if I had to manually erase quicksaves. I already limited amount of quicksaves to 3)
Oh, didn't know that. Just thought it applied to autosaves. Will have to check out what settings I have then. Thanks.