I just built my first PC, installed the OS, all the software I want, and updated all my drivers. Now I want to make an exact copy of the entire install of my system drive onto an external hdd. When I go to reinstall Windows months from now due to Windows rot, I want to save time by just coping the external hdd onto my reformatted system drive. I'll Google how-to posts to learn how to do this, but I don't even know what it's called. Can someone just tell me the term and send me in the right direction for my research?