My iPhone 5 is also running 7.1.2 and for the life of me I cannot get a backup to load on my iPhone 6. My desktop is running OS X 10.9.5 but I doubt that is relevant to my issues. I had to restore my iPhone 5 a week ago, no problems there.
iTunes gets stuck at the last part restoring the apps. The first 2 pages of my apps are restored to the iPhone 6, but all of them say "Waiting ...". The rest of the home screens are missing apps. Not sure what to do. Tech guy at an Apple Store was not very helpful.