IPhone 4 problem with songs?

Okay so I have a iPhone 4 I've been using for like 3 months it's perfect I got it from some girl on Craig's list. But when I got it I backed up my 3GS and then restored the 4 with the backup of the 3GS so I could still have all the text messages and such. It was fine but I go to try to put music on this iPhone 4 today and it says that In order to change it to manually sync whatever song you want I have to erase everything on this phone and sync it wit iTunes. But if I did that could I do the back up and get everything back or no? Would I loose everything?

Use a software like DiskAid to transfer songs/movies/whatever else from the iPhone4 to the computer because iTunes won't let you do that

Then Sync

If you sync before the transfer, iTunes will delete the songs on the iPhone and replace them with the ones in iTunes

DiskAid is available at http://www.digidna.net

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