i wanna ask something about uplaod photo from pc to iphone.

I uploaded photo using itunes by sync from folder. But I had a problem.

Last time I uploaded folder A into Iphone. So now I wanna upload folder B. Once I sync, why my folder A is missing and only left Folder B? Don't tell me everytime I upload photo to iphone, i need click all the folder and sync it back together?

I got some question here regarding the iphone sync.

If i format my computer, that mean all my data inside iphone will be deleted once i plug my iphone into usb?

No way to sync all my iphone file into computer first only sync back to iphone?

I facing a very big problem now.

My computer messed up and I formatted it. So now when I connect my iphone into computer, I cannot do any sync because it will erase my phone library. Mean all my song and apps will be erase. Any way to solve this?