Always back up your internal storage/data when flashing a ROM on WM handset. I've learned the hard way a couple times already ;(.
Could you simply copy to an external memory card(?) Might make things a bit easier.
I know this is old news but i wanted to install software update CF03 for my Samsung Omnia (SCH-i910) to unlock the smartphone's GPS for use with other location-based services(Google maps). I just wanted to know if I need to back up my data before installing. I have lots of pics, contacts, and programs(SPB mobile shell 3.5 mostly) i dont wanna lose. Thanks!