Wife upgraded to a 6+ from 4s, had iCloud backup on, including photos. She was however on 7.?.? iOS on that 4s. When setting up the new phone, restored from a backup.....but only 400 out of 1000 photos moved. Help me understand why this would be and what solution would there be to get the rest. I thought with iCloud backup on, and photos switched on, that they'd all be backed up and move over when restoring from backup. Any ideas?