However the first problem I have found with the software I'm using. The GUI only shows support for Ext2. The 2TB drive has my data on it in an Ext4 partition. This is my only drive this big. Thankfully there is less than 1TB of data on it which means that I can use my external Hard Drive. Unfortunately it is currently also formatted Ext4.
So with the 2TB drive plugged into my only other computer that can plug into it, I have also connected my external drive and am reformatting the external drive.
But I have found a new home for the NAS. For now anyway.
So the beginning for a very exciting project. But still a little way to go before I am happy with the way it is set up.