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.
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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.