Here are the stats from a backup of 1 server with approx 600gig

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                   Original size      Compressed size    Deduplicated size

This archive: 592.44 GB 553.58 GB 13.79 MB All archives: 14.81 TB 13.94 TB 599.58 GB

                   Unique chunks         Total chunks

Chunk index: 2760965 19590945

13meg… nice