Data Deduplication is a specialized data compression technique for eliminating duplicate copies of repeating data or redundant data. Advantages:

• Reduced storage capacity required for a given amount of data.
• Ability to store significantly more data on given amount of disk.
• Restore from disk rather than tape may improve ability to meet recovery time objective (RTO).
• Network bandwidth savings (Client side deduplication).
• Lower storage-management and energy costs resulting from reduced storage requirements. 

Disadvantages:

• Deduplication consumes CPU cycle on the file.

[caption id="attachment_4658" align="aligncenter" width="500"] Photo Courtesy: Rupen Rajkarnikar[/caption]

Data Deduplication service is provided by these products. ReFS, Symantec Backup System, EMC Backup System, Oracle Optimize Solution, IBM TSM and HP Backup System.