What do u mean by data? Do u mean like contacts or just files that help the computer remember the iPhone?
Sorry for so many questions :/
Let's say you bought Pages (a word processor designed for the iPad by Apple). If you had created a letter or some other type of document, that would be data for Pages. It would be your work.
Let's say you play games and have saved your progress and would like to restart there when you start up again. Or your email / txt messages or iMessages messages. Basically, anything you create on your iPad/iPhone using the Apps that either come with it or you buy. Those things cannot be recovered unless you back them up. Your apps that you buy, your movies or music, that you bought from iTunes, can all be redownloaded pretty much anytime you like, so you don't have to save that (you might have to save your place in a book though, so be careful there). T
Since I don't really know what you have been doing on your iPad I've been trying ensure that you don't lose anything important. But if you have no real data, or you're confident you can live without any thing you have created, then you can just forget about data. It would mean you'd be starting fresh on your new iTunes.
I'm assuming that you have something you want to protect which is the reason you are transferring your old iTunes over to your new laptop.