Do I have to back up the data of my macbook white unibody if I am changing the screen because of the crack problem at the the back of the screen?

Do I have to back up the data of my macbook white unibody if I am changing the screen because of the crack problem at the the back of the screen?
They told me to bring it to the genius at the apple store. They will change it for free but I don't have any physical place to back up my computer, they said it will take a coupe of days. I am not really sure if I have to back it up.
Thank you.

gmedina172 wrote:
Should I use time machine? ...
Mac 101  Time Machine  >  http://support.apple.com/kb/HT1427
Time Machine Tutorial  >  Time Machine Tutorial
Video on Restore From Time Machine
http://support.apple.com/kb/VI29

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