The result of data deduplication is that the first full backup of a server will be stored almost in its entirety except that a small amount of deduplication of chunks will occur within the initial backup. Subsequent full backups of a server will store only the additional chunks of new or changed data (for example, parts of changed files or newly created files). The result of deduplication is that tape rotation schemes (for example, GFS) which would have traditionally resulted in large amounts of duplicate data being stored on disk (or tape) now take up only the disk space of the last full backup and any unique data that existed in previous backups but has now been removed. This means that many more backup versions can be retained with no penalty on disk space.
- HP StorageWorks D2D2500 Replication Licence To Use