I want to re-install Mountain Lion, but not erase my Finder content...

It is unclear if I re-install the Mountain Lion from the Alt + Option setting, or re-install from the App Store will erase the content of my Mac. Which is the better way to go.

READ FIRST: https://discussions.apple.com/message/21654755#21654755
Also I went to the Apple Store when I had the chance to, they gave me an erase (I had a backup handy) and the backlight keyboard worked! Then I restored with the Time Machine backup and back to problems... So it's clearly a software problem as crazy as it sounds...

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