post-processing deduplication (PPD)
Post-processing deduplication (PPD), also known as asynchronous
de-duplication, is the analysis and removal of redundant data after a backup is
complete and data has been written to storage. PPD
can be contrasted with inline deduplication, a process in which redundant data is identified and
referenced (instead of copied) while the backup is being written.
Both methods have their own advantages and disadvantages. One advantage of PPD is that because
the backup is straightforward, it takes less time. A disadvantage of PPD, however, is that the
storage administrator must have enough space to store the full backup somewhere until the duplicate
data is removed.
This was last updated in August 2010
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