Should I jailbreak a 'clean' iPod or should I get everything installed and set up the way I like it before jailbreaking? I'll backup first of course. Also, what happens if I jailbreak, then unjailbreak? Will I lose any apps or data? Can you do a backup as normal whilst jailbroken? Will 'unjailbreaking' force me up to 3.1.3? (I know how to downgrade so it wouldn't be the end of the World but I'd rather avoid it).