I have a Server 2012 R2 box. Local disks are basic NTFS disks and external USB drive is basic NTFS as well. The backup is configured to use the USB drive as a dedicated drive. I am using the built in Server 2012 R2 Windows Backup (not a 3rd party).
It always does a FULL backup and never an incremental.
Any ideas as to why or how to fix it? It's trying to back up over 600GB a night...