It is not required, but it is recommended. You should back up your iPod before a jailbreak nevertheless...
You should not jailbreak your iPod Touch. Jailbreaking comes with many risks involved in it. Among these risks is that of voiding your warranty, so if the jailbreak actually 'breaks' your iPod Touch, the warranty will not replace it for you for free.
Should be out now
How to jailbreak my iPod touch
to jailbreak your iPod 4.1 go to greenpois0n.com
you use spirit. search spirit jailbreak on google and you should find it.
No. Your jailbreak will remain as it is. Syncing your iPod does not alter the jailbreak in any way.
to jailbreak your ipod 4.1 go to greenpois0n.com
No but you can jailbreak an iphone or ipod touch but they each have different sites to jailbreak your ipod/iphone
Redsn0w.
sync it using itunes that should do the trick
NO, it's actually better to have an older ipod to jailbreak it because it takes months for hackers to make a jailbreak for new ipod firmware.