Archivist

From the Wikipedia page - which includes some detail of archival training in different countries.

An archivist is an information professional who assesses, collects, organizes, preserves, maintains control over, and provides access to records and archives determined to have long-term value. The records maintained by an archivist can be any form of media (photographs, video or sound recordings, letters, documents, electronic records, etc.)

See also List of archivists