I'm about to Jailbreak my brother's old iPhone 2G. I have plenty of instructions on how to do it, but I've read a lot of conflicting information on how to update the iPhone when new iPhone firmware comes out. Is there a basic tutorial on how to do this and whether it's necessary to back up information and apps? I will not be using non-app store apps, I'm only jailbreaking to get around the data plan. I don't want to make a frustrating mistake when the new jailbreak 3.0.1 firmware is available.