iOS8 Backup not working
I have a new iPhone 6, iOS is all up to date. I am unable to complete a full iCloud back up. Have tried to do this manually, it starts,says is is backing and estimating time however after 30 or so minutes, stops and say's backup failed.
I have 200GB of iCloud storage and am only using a fraction of it.
Am backing up via USB connected to an iMac. I also have a MacBook Air which is faster but isn't the machine I use to sync by phone, does that matter is I use the MacBook to simply run the iCloud backup?
Any ideas?
iPhone 6, iOS 8, 128GB