Unlike tape solutions and other disk-based back up systems, only the REO series includes REO Protection OS software, which embeds data protection intelligence. It also provides a core set of volume and device virtualization, management, and connectivity features found only in REO series appliances. When configured as virtual tape, backup data is written sequentially and in large blocks, which results in greater backup performance. In addition, REO series virtual tape appliances are not susceptible to disk fragmentation, viruses, manual volume management, hackers, ongoing tuning, or file system overhead - all are common problems found with general purpose disk-based backup systems.And only REO series includes patent-pending Dynamic Virtual Tape (DVT) technology, which ensures that no storage capacity is wasted while eliminating the manual effort and guesswork of sizing, configuring, provisioning, and deleting virtual tape cartridges. With DVT, users can create virtual tape cartridges that automatically expand or shrink to match the exact capacity requirements of the backup operation.The Overland REO 4500 VTL Disk-Based Backup and Recovery Appliance with Protection OS enables fast, reliable data backup and recovery, and up to 2:1 virtual tape data compression. Easily configured as disk volumes (LUNs), dynamic virtual tape drives, and/or a virtual tape library the REO 4500 VTL is compatible with all popular backup software, physical tape drives and libraries for easy integration with Ethernet (iSCSI) and Fiber Channel networks. Patent-pending Dynamic Virtual Tape ensures that no capacity is wasted and simplifies virtual tape management. Embedded Protection OS software delivers intelligence along with enhanced features via software PACs. A browser based interface provides proactive monitoring and management.