ExaGrid Systems, Inc. is a disk-based backup hardware company that was founded in 2002 and is headquartered in Westborough, Massachusetts, with several satellite offices throughout the United States, Europe and Asia.
The ExaGrid system is a disk backup appliance with data deduplication that works with existing backup applications (see List of backup software). ExaGrid uses compression and data deduplication (sometimes called Capacity optimization) to minimize the amount of data stored. This works by using standard data compression for the most recent backups, along with saving only byte-level changes from backup to backup for all previous backups. This approach can reduce the disk space required for disk-based backup storage by 20 to 1.
A second system can be installed at another location to supplement or eliminate offsite tapes, providing disk-based recovery in the event of a disaster. The data deduplication technology only moves changes over the Wide area network, reducing WAN bandwidth requirements.
ExaGrid derives its name in part from the internal Grid computing architecture used. ExaGrid data deduplication servers virtualize into the GRID to present a single pool of memory, processor and disk storage. This allows the system to grow as backup data grows, without degrading performance.