You can back up the contacts on your Apple iPhone using iTunes on a Mac computer. This process is called "syncing" and it can be used to back up a variety of other information from your iPhone as well. You can also set information on your Mac to sync to your iPhone. Once you set up syncing, the iPhone will back up the contacts, and anything else you choose, every time you connect the iPhone to the computer.
Things You'll Need
Go to the "Apple" menu of your Mac, select "Software Update" and press the "Install" button if any new versions of iTunes are available.
Plug the cable that came with the iPhone into the phone and the computer. iTunes will open automatically. Click on the iPhone under "Devices" on the left side of the window and go to the "Info" tab.
Indicate whether you want to sync "All contacts" or "Selected groups." Enter any additional syncing settings.
Click the "Apply" button in the bottom-right corner of the window to sync the iPhone to the Mac. The backup data is stored in the "Backup" folder, which is in the "MobileSync" folder, which is in turn in the "Application Support" folder inside the "Library" folder.
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