Interesting topic. From what I've gathered though, Red, Green, Blue or Black today's 2TB HDD have a limited life span so regardless of which one is chosen, you might has well purchase 2 and use one for back up. So during my HTPC build, If I decided to purchase two, regardless of color, is this where the whole RAID back up strategy comes into play?
The case that I am purcashing has more than enough room and can easily hold 8+ 3.5 HDD. If I decided to purchase more than one HDD, would it be the smart thing to turn my htpc into a mini nas in of itself to back up the HDD since it is only a matter of time before the HDD fails. If yes, besides the 8 to 9 pieces that would be needed to purchase to build the HTPC what would be needed to purchase to turn the HTPC into a NAS as well. What are the pros and cons into building this all in one system.