I use Ubuntu and used to format pretty often (I used to like restarting from scratch every now and then). My approach is keeping the old OS partition and copyin

I use Ubuntu and used to format pretty often (I used to like restarting from scratch every now and then). My approach is keeping the old OS partition and copying data from there when I need them, configurations included. I like this approach because in this way I automatically trash stuff that I added but that I don't need anymore.