“Our DataDomain unit has significantly reduced our backup and restore burden. Tape usage, which previously required weekly manual intervention, is now reduced to an occasional rotation for off-site storage. Even with our wide variety of data, including everything from e-mail to already compressed data sets, we are seeing an aggregate 10x compression ratio. The increased capacity and flexibility our DataDomain unit provides allows us more backup options for our departmental users and has made backups and restores an order of magnitude faster.” — Scott Karlin
Manager, Computing Facilities, Department of Computer Science, Princeton University

Press Release

Data Domain, Inc. to Report 2008 First Quarter Financial Results on Thursday, April 24, 2008

SANTA CLARA, Calif. — April 1, 2008 Data Domain (Nasdaq: DDUP), today announced it will release financial results for the first quarter ended March 31, 2008, shortly after the close of market on Thursday, April 24, 2008. Data Domain will host a conference call and live webcast at 5:00 p.m. Eastern Time (2:00 p.m. Pacific Time) that day to discuss the first quarter results.

For parties in the United States and Canada, call 800.591.6945 to access the conference call. International parties can access the call at 617.614.4911. The participant passcode is 46364463#.

Data Domain will offer a live webcast of the conference call, which will also include forward-looking information. The webcast will be accessible from the "Investor Relations" section of Data Domain's website (www.datadomain.com). The webcast will be archived for a period of 30 days. A telephonic replay of the conference call will also be available two hours after the call and will run for two days.

To hear the replay, parties in the United States and Canada should call 888-286-8010 and enter passcode 69749574#. International parties should call 617-801-6888 and enter passcode 69749574#. In addition, Data Domain's press release will be accessible from Data Domain's website before the conference call begins.

ABOUT DATA DOMAIN
Data Domain® is the leading provider of Deduplication Storage systems for disk backup and network-based disaster recovery. Over 1,500 companies worldwide have purchased Data Domain's storage systems to reduce costs and simplify data management. Data Domain delivers the performance, reliability and scalability to address the data protection needs of enterprises of all sizes. Data Domain's products integrate into existing customer infrastructures and are compatible with leading enterprise backup software products. To find out more about Data Domain, visit www.datadomain.com. Data Domain is headquartered at 2421 Mission College Blvd., Santa Clara, CA 95054 and can be contacted by phone at 1-866-933-3873 or by e-mail at sales@datadomain.com.

Note: Data Domain, the Data Domain logo and Global Compression are trademarks or registered trademarks of Data Domain, Inc. All other trademarks used or mentioned herein belong to their respective owners.

Contact Information

Data Domain

Edward Luboja
914-698-1346
press@datadomain.com