Sync photos to iTunes without erasing everything?

"You can sync with multiple iTunes libraries with MultiTunes on a jailbroken device. Also if you transfer your old itunes library.itl and itunes library.xml file to your new library then your ipod can sync without being erased. If need be you can also transfer all your music movies and pictures ect off your ipod onto your computer then sync. Here is a guide with more information if you want to read more:

http://appducate.com/2013/01/sync-an-ios-device-to-multiple-itunes-without-erasing/"