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How to backup Windows 7 and revert upgrade to Windows 8

I want to update my windows 7 to windows 8 but before I do so I would like to know if I can revert back to my previous version of windows (ie windows 7) in case of some compatibility issues or otherwise.

Also I have a genuine copy of windows 7 so will I have to purchase the licence key again and will this upgrade or downgrade be similar to a ubuntu upgrade? ( ie safe and smooth)

marked as duplicate by slhck Oct 28 '12 at 13:08

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No, an upgrade is not reversible. But you can just make a backup and restore that, which should be the easiest option.

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