What's the difference between deduplication and compression?

A: Deduplication is an intelligent compression process in which large common data segments are replaced with far smaller indexes that point to one common single instance of the common data segment.  Compression is the process of replacing repeated bit patterns at the byte/word level with an index or count of the bits that were repeated.  Compression is only aware of a few bytes of data, deduplication is aware of weeks, months and years worth of data patterns.

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