SANTA CLARA, CA--(MARKET WIRE)--Oct 1, 2008 -- Data Domain, Inc. (NasdaqGM:DDUP - News) today announced it will release financial results for the third quarter ended September 30, 2008, shortly after the close of market on Thursday, October 23, 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 third quarter results.

For parties in the United States and Canada, call 866-510-0710 to access the conference call. International parties can access the call at 617-597-5378. The participant passcode is 50992752#.

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 72345707#. International parties should call 617-801-6888 and enter passcode 72345707#. 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. Over 2100 companies worldwide have purchased Data Domain systems to reduce storage costs and simplify data management. Data Domain delivers the performance, reliability and scalability to address the data protection and nearline storage needs of enterprises of all sizes. Data Domain products integrate into existing customer infrastructures and are compatible with leading enterprise backup and archive 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:
     Ed Luboja
     Director of Communications
     Data Domain, Inc.
     +1.203.210.7404
     edward.luboja@datadomain.com