Q: Itunes 11.0.2 could not backup the iphone because an error occurred

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When attempting to create an iPad, iPhone, or iPod touch backup, iTunes may display one of the following alert messages:

• iTunes could not back up iPhone because the backup could not be saved on the computer
• iTunes could not back up the iPhone because a session could not be started
• iTunes could not restore this iPhone because the backup session failed
• Cannot copy: Data error (cyclic redundancy check)
• Unable to restore from this backup
• Backup session failed
• iPhone refused the request

You can resolve backup errors by following the steps in this article.

Resolution

Simply restarting the computer and the iOS device may resolve a backup issue. After restarting, attempt to restore again. Learn how to restart your iOS device.To perform the rest of steps in this article, you need to be logged in to the computer as an administrator. If you're not sure if you have administrator access, contact the owner of the computer or the system administrator.

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1. Back up your backup

2. Update to the latest software

3. Disconnect other USB devices

4. (Windows only): Check for Layered Service Providers (LSPs)

5. Check security settings

6. Back up using a new user account

7. Reset the Lockdown folder

8. Windows only: Update your USB chipset drivers

9. Back up on a different computer

Additional Information

If you are using Windows and iTunes stops responding when backing up an iOS device, follow the steps in Apple software on Windows: May see performance issues and blank iTunes Store.For more information on restoring from a backup and on backing up in general, see the following documents:

• iTunes: Backing up, updating, and restoring your iPhone, iPad, and iPod touch software
• iOS: About backups
• iPad 2: Unable to restore from an iPad backup
• iOS: Unable to restore from iOS 4.3 backup
• iPhone and iPod touch: Syncing not enabled error message after restoring from a backup
• iPad displays Apple logo with progress bar after updating or restoring from backup

If you have performed all the steps in this article and you are still experiencing a backup issue, contact Apple or your wireless carrier—whichever provides phone support for your device.

To find Apple's contact information in your country, refer to Contacting Apple for Support and Service. If you use an iPhone, you can find your wireless carrier at Locating iPhone wireless carriers. Wherever you live in the world, you can find your service options at the Online Service Assistant.

After getting a new PC and reinstaling iTunes, I'd been receiving this alert when trying to backup/sync my iPhone4, but none with iPad using the same cable and environment. What solved my problem was setting the iPhone to airplane mode. I guess it was something related to sync over wi-fi (that was disabled on both devices, but was somehow causing these issues).

In aircraft mode, the back ups worked fine