It has been awhile since i have synced my iphone with my computer & this question might be dumb. I have had my iphone for almost 2 years so there is a lot of stuff on it and i have a lot of apps that have progress or other stuff that i need to be saved. will syncing my apps to itunes erase the date saved within the apps? I have tried backing it up but it doesnt work for some reason so if i do not need to back it up i would rather not.