How do I back up my profile?

Earlier today after a hanged install of .NET 3.5.1 on XP Pro, I rebooted and it said it couldn’t find my profile so it was logging me in under a temporary profile.

ALL my installations and configurations were lost!! I was in a panic and didn’t know what to do! It thought I was a new out-of-the-box user!

I power-cycled, re-logged-on and everything was back to normal. (whew!). But for the future – how do I back-up my profile so I can restore it if this happens again? Thanks!