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How far back an indexer's own database reaches, measured in days from the oldest entry it still lists. This is separate from a provider's article retention and usually much shorter: a provider may hold articles for over 5,000 days while an indexer only indexed the last 2,000. An entry missing from the indexer can still exist on the server, and vice versa.
Browse all terms in NZB Files & Indexing, or see the full Usenet glossary.