Like I've said in previous replies - I'm just a (very happy) employee. On launch day I did post to HN (here: http://news.ycombinator.com/item?id=1112218).
If you're interested in details, take a look at the technology section, FAQ:
http://www.nasuni.com/product/technology/
http://www.nasuni.com/resources/faqs/
It's important to note that an important feature of the Filer is that we have the capability to talk to $N cloud storage providers, see: http://www.nasuni.com/about-nasuni/partners/
Finally, you can take a look at the blog posts the team has been doing since launch. We've been covering various aspects of the Filer, including security, testing the cloud providers, etc.