Default ROM Dump and Reflash on XDA II

Ok, I'm new to this messing about with ROM's etc, but two easy questions.

1. How can I dump my XDA II ROM (somewhere) pref. not SD card, and then rewrite it to a different XDA II without killing either device ?

2. Is the SIM lock code part of the ROM ? If it is, will the lock status be taken across when the first ROM is written to the second device.

Idiot proof instructions appreciated !!!! - or am I just barking totally up the wrong tree ?

Has anyone either done this or know how to do this ?

Thanks