Back up for iphone on itunes?

So I'm trying to backup my iphone just in case ios8 download fails. This is my first using itunes and when I plugged in my phone itunes went into the new iphone screen. It gave me two options. 1 was setup as new iphone. 2 was restore from this backup (it was my pad backup) i dint want to have to restart on my iphone so how do I make a backup?

There's a well-known iTunes alternative named AnyTrans, it helps you backup almost all the data to your PC by transferring the contents to your computer. After you install iOS 8, you can also use it to transfer all the data from your PC to your iPhone.http://www.imobie.com/support/what-to-do-after-ios-8-update.htm This article tells you info on what to do after updating to iOS 8

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