Root Backing up stock ROM

[greeklegend]

Hey all,
I'm about to install Cyanogen on my HTC magic (three australia), mostly so i can connect to uni's WPA-EAP network. However, i'm a little nervous about bricking my phone or finding that the cyanogen rom is too buggy or not as good as the stock one. Is there a way i can back up the rom that is on my phone at the moment, so that i can revert to the factory one if i change my mind?
Thanks

 

[vikingisson]

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[greeklegend]

Heh, i went ahead and rooted my phone anyway, and so far havnt had any problems with cyanogen. no risk, no reward

 

[LarryMartin830]

is there a way to back up a eris? the rom

 

[Swizz]

I'm not sure if you're G1 or MyTouch, here are the "unroot" or stock methods for both:

How to Un-root your G1 - GetYourDroidOn

Unroot MyTouch