Data backup - what's most important !?

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Hi after i had cleaned up my system i would like to back up the most
important files(?) on dvd. I will backup documents which were saved on
desktop, furthermore,i will save user profiles form documents&settings,
installation zips, personal files(directory) and program files where most
important programs are stored. In short(or in a little longer then short
:) ), what are the most important directories and files, i.e. data which i
would need to have on my dvd in some imaginary 'broken hard' scenario and/or
which data you are recommending to have backuped?




I just don't have confidence into win dows because these things are
automated, and i would need to read all of 'Help and Support Center' huge 15
articles


.