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Have you got an error in iTunes that your iPhone “disconnected” during a backup or restore on your Mac/PC? In fact, this means that the backup or restore stopped when iTunes didn't expect it to due to some error. In this case, how you can solve this problem?
Also Read: How to Solve iTunes Invalid Response Error?
Also Read: iTunes Could Not Backup the iPhone Because the Backup Was Corrupt
Reason: It is usually accompanied by a very vague error message like iTunes could not back up the iPhone “(name)” because the backup could not be saved on the computer, or "a session failed" message, with a suggestion to disconnect and reconnect the device before trying again.
There are some potential solutions to fix the “iPhone disconnects during backup” or “iPhone disconnects during sync” when backing up to iTunes, just read and try them one by one.
However, before you start to fix this problem, there are two details you may need to make sure:
1. Connect your iPhone to your computer.
2. You did not jailbreak your iPhone.
Part 1. Fix iTunes Could Not Backup the iPhone Because the iPhone Disconnected
Part 2. Fix iTunes could not restore the iPhone because the iPhone Disconnected
Part 3. Best iTunes Alternative to Backup/Restore iDevice
Step 1. Update iTunesGet the latest version of iTunes firstly, this alone may resolve the problem if the iOS version is newer than what is supported by the version of iTunes.
Step 2. Rename the backup fileSo, it does not conflict with a new backup by appending something like “-OLDBACKUP” to the folder name, the iTunes & iOS backup files are located in the user folders depending on the desktop OS:
Mac OS X: ~/Library/ApplicationSupport/MobileSync/Backup/
Windows 8, 7, Vista: UsersUSERNAMEAppDataRoamingApple ComputerMobileSyncBackup
Step 3. Back Up nowSelecting the iPhone, iPad, or iPod touch from the devices menu and choosing to “Start Backup”.
Up to now of the steps, the backup should complete to iTunes as expected. If not, here you may continue with the next few set of troubleshooting steps.
Generally, it is sufficient to rename the backup file, but in some situations, you may need to make a copy of the existing backup file and move it to another location on the computer, then delete the old (possibly corrupt) backup from iTunes through Preferences > Devices > Delete Backup.
Step 1. To fix “iPhone disconnects during restore”, firstly you should disconnect any USB cables between your computer and your iPhone.
Step 2. Reboot the computer and restore with to fix any potential USB connection errors.
Step 3. Reboot the iPhone by pressing the top or side (lock) button until a “slide to power off” slider appears.
Step 4. Slide to power off, and then power back on later. If the iPhone is not freshly setup, you can also try doing a Reset Network Settings in the Settings app → General → Reset → Reset Network Settings.
iOS Data Backup & Restore
Backup and restore any item on your iOS device, and selectively export what you want to your computer.
iPhone 7 Plus, iPhone 7, iPhone SE, iPhone 6s Plus, iPhone 6s, iPhone 6 Plus, iPhone 6, iPhone 5s, iPhone 5c, iPhone 5, iPhone 4s, iPhone 4 that run iOS 11/10.3/10.2/10.1/10.0/9.3/8/7 etc.
All models of iPad Pro, iPad Air, iPad mini, iPad
iPod touch 5, iPod touch 4
Windows 10 or Mac 10.11
Windows 10/8.1/8/7/Vista/XP; Mac OS X 10.12(MacOS Sierra), 10.11(El Capitan), 10.10 (Yosemite), 10.9(Mavericks), 10.8, 10.7, or 10.6
Step 1. Launch the iOS Data Backup & Restore program on your PC/Mac
Step 2. Connect your iPhone the computer, and run the program. Then select "Data Backup & Restore".
Step 3. Now your devices will be detected by the program, then you can select what file types to backup and click on "Backup".
On the other hand, you may also try another iTunes alternative to Backup your iPhone with/without iTunes.
Step 4. Restore your iPhone data to the Devices or the Computer.