Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
if you connect your device to itunes, and then right click on your device(inside of itunes) you'll be given the option to backup manually. I would do that before jailbreaking just to be sure
 
if you connect your device to itunes, and then right click on your device(inside of itunes) you'll be given the option to backup manually. I would do that before jailbreaking just to be sure

I didn't do that, and even after restore, update, re-jailbreak, then restore my backup my iMob account was as it was before.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.