The German term "Datenbasis" (un- or processed data resource) could be simply translated into database, as Langenscheidt shows Link to Langenscheidt's Translation. But imagine, when you write about something pretty scientific, you would perhaps gather data which needs not to be in digital form, but could be results of measurements done manually and written down on paper.
So what is the term for a collection of such data that has not been deposited in a database of a computerized database management system such as Oracle, MySQL etc?