Exactly the way I have also understood RAID1, thank you for confirming this Sorry to say that I can't exactly make what I wanted, due to very limited space in my chassis - so was only able to fit in 2x2TB+1x3TB+64GB. As in, one primary data drive of 2TB, one daily clone of that drive also of 2TB, hourly 3TB TimeMachine partitioned into two so it also covers the 64GB OS SSD. The OS SSD is then cloned once a day to an external 64GB USB3 stick. Not really as good, but very damn close. Covers data corruption due to the time machine, covers drive failure due to the clones and also already have a brand new 2TB spare drive in original box laying on it's shelf here at home for the event one of the 2TB drives gives up. Not bad not bad... But no RAID... Anyway, thank you a bunch for ideas and input to my original question, you guys are awesome!
