I can't sync my iphone5 to a new laptop?

I've had my iphone5 for nearly a year, and previously it was sycning to an at home computer. But one i bought my laptop I wanted it to sync to a new itunes library (i downloaded all new music). But when I plug in my iphone it sayst that it can't read the iphone and that i need to restore the phone and get it back to factory settings. I obviously don't want to do this, but there is no option letting me back up my phone first. I've tried everything and I can't seem to figure it out. I created a new apple ID and signed into that on my itunes and phone but a different apple ID is signed in on the old computer. I just want to be able to sync my phone with my laptop without losing everything.

It is referring to under devices in the iTunes source list, not on your desktop.
http://support.apple.com/kb/ts1538

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