The DSI520 is designed to help you keep pace with your rapidly expanding business by utilizing state-of- the-art deduplication for your backup systems. There is no disruption as your capacity or performance needs change…simply add a license to your existing solution. Designed with growth in mind, the entire DSI520 series can increase its storage capacity via 1TB repository licensing increments. There is no need to purchase more backup capacity than you need. Ever.