Will syncing my iPhone erase all of my data?

My computer had a hard drive problem so they replaced my computer. I know syncing my iPhone (4s if it matters) to the computer will wipe the current music on my phone, which is fine. I just want to know if it will wipe my other data. Such as pictures, apps, things like that. I would just like to know if it does or not before I sync just so I can save my pictures and things to another place.

Out iTunes on your computer and sign on to your account. It won't erase anything as long as its saved right

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  • What will erase and sync erase on my iphone? I wanted to connect my iphone to a new computer but it says erase and sync, what will it erase? All of the contents or just music?
  • If you update your iPhone 4S to 6.0.1 through Wi-Fi, does it erase all your data? I have updated to 6.0 before on my laptop in iTunes, but strangely it didn't erase all my data, so I didn't have to back up. I didn't see it automatically back up during the process of updating, so I was wondering if it would erase all my iPhone data if I updated it through Wi-Fi. A few months before, when I updated to 5.1.1 it erased all my data. I'm not sure if Apple did anything to 6.0 that made it not erase my data…
  • If I erase and sync my iPhone 4 in the music library, will it erase my photos? I'm trying to add music to my iPhone 4 and when I go to sync just the music, it says 'erase and sync'. Will it delete my photos? If so, can I right click my iPhone and back it up so if it does delete my photos, I can just back it up?