@Antony Leung
While that does help, the hidden problem is that not all M.2 ports are equal. Since I am looking to plug SSDs into the ports (specifically: http://www.anandtech.com/show/9396/samsung-sm951-nvme-256gb-pcie-ssd-review) I need ports that art not only PCIe Gen3 but have space to fit the SSD's in the board.
@Electronics Wizardy
While that is an option, a RAID solution is much cleaner and more reliable. RAID 1 offers realtime backup, minimal configuration, and is seamless. Delayed backups are usually good, but often require a lot of time to setup properly.
Thanks, I wasn't really sure about that.
P.S.
There will be ongoing backups to a NAS as well; however, restoring from a RAID 1 volume is much faster.