Global deduplication compares files across the entire collection, so a document held by ten custodians is reviewed once. Custodian deduplication suppresses copies only within each individual's data, reviewing the document once per custodian.
Global produces substantially greater volume reduction.
Alternative Names:
Cross-Custodian Deduplication, Horizontal Deduplication
Why it Matters?
Global deduplication reduces review cost significantly but requires that custodian tracking be preserved, since the suppressed copies establish who possessed the material. The choice should be made at the ESI protocol stage rather than after processing, because reversing it requires reprocessing. Requesting parties sometimes prefer custodian-level deduplication precisely to see possession patterns in the production itself.
Frequently Confused with
Related terms
Frequently asked questions
What is the difference from custodian deduplication?
Why would a requesting party prefer custodian-level?
