OK - I am a complete NOOB...

I just got my moment yesterday...

I only have a G5 MAC so rooting is not an option nor is running the Sprint utility to get back to stock after doing this...

What are my options to get back to stock after flashing this ROM in order to get the 2.1 update should it ever be released...?

...And since I haven't really added anything to the phone do I need to do a backup? I have some pictures and music but they are on the SD card and won't be messed with under this process, correct?

sorry for the questions but I am a NOOB...