[ubuntu] New notebook with Windows 8: best way to back it up before removing it?

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http://ubuntuforums.org – Hi everybody! I've just bought a new notebook, with Windows 8 pre-installed. I am removing it in favor of Ubuntu. I will keep it for a 2-3 years but, eventually, I will sell it to change PC. Since I have no recovery DVD, what is the best way to back up windows 8 in order to restore the machine to an 'almost new' situation, when I will sell it? Sorry for my English, I hope I was clear enough. Otherwise, I'll try to clarify myself :)))) (Hardware)