Syncing with new computer
I previously was using itunes on our family computer. That computer is now clunky and old, and I have my own. My itunes account is linked to both my new computer and the old one and I have synced my iPhone with both many times, however, it wasn't until the new itunes update (11.1) that I have been able to figure out how to manually sync (an option I decided long ago that has caused me much grief throughout the years.) on the new laptop (since the old one still had the old version of itunes). However, since I have my iPhone synced with the old computer, it is asking me to "erase and sync" before I can start downloading from this new comouter. Is there a way around this, and when it says erase, does that only refer to music, or everything (pictures, apps, etc.)
iPhone 4S, iOS 7