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Atom file-level deduplication

The Atom deduplication feature of Double-Take RecoverNow provides the ability to deduplicate protected data on the repository server. Deduplication is the process of finding duplicate files within a data set and storing those files only once to reduce storage consumption.

Atom finds duplicate data at the file level by inspecting file contents, generating an index entry (technically known as a fingerprint), then comparing that fingerprint to a database of fingerprints for the entire data set. When exact file duplicates are found, the contents of the file are moved to a storage bin and all instances of the file are modified to reference the single file in the storage bin through the use of reparse points. Because only file contents are compared and deduplicated, files do not have to have matching file names or attributes to be identified as duplicates. Each instance of a deduplicated file will retain unique file attribute and filename information.

Deduplication occurs in real-time after the data is written to the Double-Take RecoverNow repository server. The Atom File-Level Deduplication Service initially scans through the data set looking for duplicate files, then it monitors the NTFS change journal, in real-time, looking for new or modified files as candidates for deduplication.

The Atom deduplication feature will not work if target path blocking is enabled. The option to block target paths is located on the Server Properties dialog box (Target tab) in the Replication Console.


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