Given the inexplicable demise of Drive Extender technology in Windows Home Server, I am considering other options, such as replacing it with Drobo (and a linux server).
One thing I'm not 100% clear on is the unit of redundancy in a Drobo. In WHS, I can set a specific folder as requiring redundancy and let other folders "live on the edge" without any redundancy. From what I can tell, it sounds as though with Drobo it's an all or nothing affair. I can specify that I want to be able to recover from a single HDD failure (or maybe even two) but I can't say "don't worry about creating redundant copies of these files".
Am I right in my understanding?