I'm going for it on my primary computer. I will do a clean install -- but you have to upgrade first. Yes, you have to install twice if you want it clean. http://lifehacker.com/how-to-do-a-clean-install-of-windows-10-1720775893 Since I keep most of my files in the cloud, I don't have much to backup. Maybe some game save files or stuff like that. At any rate, it will take two steps to assure I don't lose any data. 1. Image my entire drive to a backup HDD. Once you've done this, you can browse the entire image in case you need anything from it. 2. I'll run Belarc Advisor. It's a simple utility which details the configuration of your computer so, for example, you can go back and look at what type of wifi/graphics/other card do I have or what programs did I have installed. Good info that you don't know you might want...until you need it. Update: Just got an error but looks like it's because of server load. Trying again (it didn't lose the partial download). Update: Oh boy...it's working.