How to back up everything on my iPhone 4S to itunes?

I did ask a question before but no one answered it. My iPhone 4S is not working properly so apple said I should get a new one but back up the one I currently have on ITunes. Every time I connect my device to iTunes it doesent show up. I have tried going to file and then devices but when I do click on file devices doesn't even come up.

It sounds like you are having problems getting your phone into sync mode. Windows or Mac?

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