I have an ipad2 and I'm not very good with itunes. It confuses me. So I had my ipad synced with another pc and now I got a new one. I installed itunes on the new one and now when I plugin the ipad it wants to erase and sync with the new itunes. Will that wipe out all my music pics apps photos on the ipad? If it does how do I backup my app and pdf's and stuff so I don't lose it? Any help would be great.