Hard Reseting GSM Diamond

[Emcee_Madcatz]

My GPS was working for a short time with the help of the HTC GPS Tool and a few small changes. It has since died. I'm hoping a hard reset will clear all settings and I can get it to work again. So:

1. How would I go about doing a hard reset?
2. Since the hard reset clears all applications and data, will it also un-unlock my phone?

Also, is there a way I can back-up certain things instead of the whole phone? i.e. only programs and documents, no program settings.