Windows XP Service Pack Upgrade?

I have XP Service Pack 1 and want to upgrade to Service Pack 2(I know that Service Pack 3 is out.) Anyway, will that erase my entire system or just update and leave all my files alone? Should I back-up?

Update:

Also, will updating the Service Pack make my computer run slower? And can I roll-back to Pack 1 if it does get slower?

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