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Also known as: backfilling
The process of scanning older headers to extend an indexer's coverage backwards in time, as opposed to routine scanning of new articles. Operators run it group by group, often in chunks of a few days at a time, because pulling years of headers is slow and storage-hungry. Backfilling is how an indexer's retention grows beyond the date it was first set up.
Browse all terms in NZB Files & Indexing, or see the full Usenet glossary.