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#71
I'd recommend DVD's but you can do it with your external, just they tend to become write protected in the process, not all, but some. Or if you have an extra USB flash drive that would be better. The easiest way to back up your files is to copy your whole user account to your external harddrive from C:\Users\(>Your User Account<) :)
for a clean install and the other questions, I'll leave to greg :)