Backing up ipad
It really depends on a lot of things. If I've added a lot of content directly to the iPad, then it might take a considerable amount of time. For instance, if I bought a movie or two and some songs. But if I have not changed anything significant, then it only takes a few minutes to sync. I've got the 64G and so far I've only synced with a Win7 Laptop (just got an iMac though so I may start syncing with this instead).