I would like to ask if anyone has done this before.

Say I have an external drive(D) that holds my games while all their save data is in my documents folder on my SSD(C), if I use -nohomedir when I launch the game next, what will happen to the data on my SSD? Will I need to move the data manually or will it happen automatically?

The reason I am asking is because I am looking to free up space on my SSD since I have less than 35 GB free on it.