The exact error message is:
iTunes could not back up the iphone "Jons-iPhone 6" because an error occurred.
Please disconnect and reconnect the iPhone, then try again.
The error message occurs during stage 3 of backup. I installed iTunes 11.4 on my laptop to rule out a problem with iTunes on my main windows
7 computer. I replaced the usb cord to rule that as a problem.
I cannot upgrade IOS 8.0.0. to IOS 8.0.2 because itune does a backup automatically prior to installing it.
I do not want to risk an direct ios upgrade from my iphone 6.
1. I have been backing up my iphone 5 without problems all year.
2. Setting up my iphone 6 .. no problems at all. Restoring all my apps, music, etc to my new iphone 6... no problems at all.
3. My SSD drive was checked for errors as well.... no problems.
4. I did a iTunes 11.4 install repair on my main PC and rebooted my iphone 6 and PC again.
5. I installed iTunes 11.4 on my laptop windows 7 x64, authorized the laptop with apple... same exact error message without an error number.
6. I am receiving the same error message on the laptop, at (iTunes could not back up the iphone "Jons-iPhone 6" because an error occurred.
Please disconnect and reconnect the iPhone, then try again.
If there was an error message number, tracking and fixing the problem would not be an issue for me. I have been using iTunes since
my iphone 3, iphone 4, iphone 5, ipad2, ipod, and now iphone 6.