a digital copy of an analog record
A digital surrogate is merely any digital copy of a record on any analog medium, such as paper, parchment, motion-picture film, analog audio, and analog video. The reasons for producing a digital surrogate vary but include protection or replacement of the original, creation of a copy for the archives so the original may be retained by the creator, improving accessibility, or creation of a more legible or audible version of the original. The creation of digital surrogates may be confined to the production of a duplicate of one record in a collection or to the production of surrogates for every record therein. The precursor to the digital surrogate, of course, was the micrographic copy.