Nasuni – The Gateway to Cloud Storage
http://www.nasuni.com/

Nasuni delivers expandable cloud storage and full protection for your business files.
Your capacity automatically expands as your business does. Never reprovision again.
Their solution can replace your current file backup/restore and disaster-recovery schemes. They run a NAS-like software appliance on a server in your office, and link it through the Internet to the third-party cloud—or clouds—of your choice. Your files are then all kept safely off site and out of trouble, while secondary copies of your working set are cached back for fast-access local use. Their software tracks changes to the local copies and sends them to the cloud, so your complete set is always up to date. Features include: a) Unlimited storage; b) Complete file protection; c) Local-like performance. d) Choice of cloud providers; and e) Fast restore. This has been added to Grid, Distributed and Cloud Computing Resources Subject Tracer™ Information Blog.