Why does my ipod touch back up every time i plug it in?

Question

and how can i stop it

Answer 1

Because that's what they do.

Turn off auto-sync.

Answer 2

I'm having the same problem, and despite what Murtagh says, It will back up every time and its always long(regardless of if i add new apps or not) even if i have done absolutely nothing with the ipod. I never had this problem on my old computer. it's kind of ridiculous, I sync my ipod, let it back up, then I later restart my computer and it has to back up all over again. takes like 10 minutes  

Answer 3

There was a "cross" on the right of that small screen in itunes when ur ipod is backup. just press it. it will stop. normally it takes long because u got too many apps on it. also if u fininished once back up, don;t change a lot apps next time, it will be less in one miniute!