Drobo looks like a nice option if you are looking to upgrade your server or add more data storage.
Drobo, the World’s First Storage Robot – develops automated data storage products designed to ensure data is always protected and easy-to-manage. Drobo is infinitely expandable and provides RAID-like reliability. Unlike other storage arrays, however, Drobo uses patent pending software that is designed for non-technical users who demand reliability without the hassle of RAID. Key Features of Drobo includes some of the most advanced automated features available – including self-monitoring, self-healing and an easy-to-understand visual status and alert panel.