iOS 7: How to Backup Your iPhone Before Updating.
With the upcoming release of iOS 7 it is important to take proper steps to on how to backup your iPhone 4, iPhone 4S, or iPhone 5 before attempting this update. Here are step by step instructions on how to back up the data on your iPhone 4, iPhone 4S, or iPhone 5.
Step one: Connect your iPhone 4, iPhone 4S, or iPhone 5 to your computer via USB sync cable.
Step two: By default, this will launch iTunes and start the sync process, which includes making a backup. However, if your iPhone isn’t set to auto-sync, continue on to step three.
Step three: Click the Summary button for your iPhone. Then, in the Backups section, click the Back Up Now button. Depending on how long it’s been since your last backup, this might take 30 seconds or several minutes. Either way, that’s it, you’re done.
Step one: Make sure your iPhone is connected to a Wi-Fi network.
Step two: Tap the Settings icon, then tap iCloud.
Step three: Tap Storage & Backup, then Back Up Now. Again, this might happen quickly, or it could take a while.
That’s all there is to it! Now you can go forth and install iOS 7, with every confidence that if something gets mucked up along the way, you should be able to restore your iPhone to its previous, working, iOS 6 state.
Also see this article on Apple’s support page detailing the process: http://support.apple.com/kb/HT1766