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 This article describes some important non-textual or “under the hood” aspects which are generally unknown to researchers and users of web archives. It argues that providers of web archives should in future make available such information and consider this as an integral part of web archives.This article was written for and accepted by RESAW Conference, “Web Archives as Scholarly Sources: Issues, Practices and Perspectives”, 8 – 10 June 2015, Aarhus University, Denmark.