Q: My iPhone 6 Plus can't backup on new macbook
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Jun 27, 2016 9:15 AMby Demo,HelpfulYou have to provide more information that that. What happens when you try to backup? Does iTunes see your iPhone? Maybe one of these two support articles will help. If not, post back with detailed information about the problem.
If your iTunes backup couldn't be completed or you can't restore from a backup - Apple Support
If iTunes doesn't recognize your iPhone, iPad, or iPod - Apple Support
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Jun 27, 2016 7:12 PMby Demo,HelpfulWith the release of iOS 9.0, App Thinning was introduced. App Thinning allows for only the features that work for your device to be downloaded rather than the entire app with features that will not work on that particular device. It saves space on iOS devices.
Apps no longer transfer from your device into iTunes. You can set automatic downloads up in iTunes for Apps. You will still have to update apps in iTunes as well as on your device or just update in iTunes and then sync.
Look at this discussion.
