Tex_chappy :
I had thought of using a raid 1 as a backup solution in the case in addition to the cloud and nas options.
Actually, RAID 1 is not a 'backup'.
It serves one and only one purpose...to allow the system to carry on running if one drive physically dies.
Any accidental deletion, corruption, virus, etc, etc...it just happens on the two drives at the same time.
There are MUCH better ways to actually backup your data. In a manner that is easily recoverable.