The backup button on the iPhone is a very handy feature to have. It can be used to back up your data to iCloudor your computer.
To back up your data to iCloud, go to Settings iCloudBackup. Make sure that iCloudBackup is turned on and that your iPhone is connected to a Wi-Fi network.
To back up your data to your computer, connect your iPhone to your computer and open iTunes. Click on the iPhone icon in the top …