So I want to install Ubuntu by booting it from my external USB drive, as is outlined here. The thing is, I read here that the drive will be erased. My external drive is a 500GB HDD with a LOT of stuff on it, over 350GB of stuff, and I don't have anywhere to back it all up on (not to mention it would take a good while to do so, and then put it back again afterwards).
I do however see that the second link uses a different method than the first, so does the first also require the disk to be formatted? And if so, is there some way I can do this without formatting my entire drive?
My DVD drive is having issues so I can't install it from there, and a Wubi install doesn't want to work, so this is the last option I know of.