Registery back ups??????

[PineApple Express]

Ok I just got my Titan (Sprint) phone. I have followed these forums for several weeks. Without the phone in hand makes these forums just reading materials. I see that if you have downloaded the PHM Registry Editor you can make changes and tweaks. But as in any tweaking and for phone returns one needs to keep the original registry available. Just how or what program will back up the original registry. Will PHM allow you to back up the original registry?
It would be helpful if some one would do a step by step on backup of the registry and make it a must and keep it as a sticky.

Thanks
Chuck
PAE