I have about 5 TB's of storage but its spread across 3 DVR's, not to your extent Rich, but I'm single so I didnt need more than a couple DVR's for my different viewing areas. 2TB's per HR2X gives me about 400-450 hours of HD per DVR....it'll never all get watched. Meaning at some point, even I will lose recordings when an HR goes belly up. BUt I've never lost recordings to a failed HDD since I switched to eSATA. At the 1st sign of any problems, I'm copying the drive over, and voila, like new.
We've both solved our problems with losing content. Both in different ways, both work.
If you are not involved in the testing and put a huge RAID array on a Genie...well, you've been warned. If I get one, it'll only have a 2TB drive externally. Just like the rest of my HRs. More than that is much more than normal folks need or will use.