Large datasets often have redundant data. For example, with user file shares, multiple users tend to have files that are similar or identical. As another example, with software development shares, most binaries remain largely unchanged from build to build. Data Deduplication is a feature in Windows Server that reduces costs that are associated with redundant and uncompressed data by storing duplicated portions of files only once and compressing the data after deduplication. Learn more by visiting the Using Data Duplication documentation.