According to Foster’s description of an archetype, it sounds to me like it is the prototype for recurring patterns or components that authors use in their stories as plot or symbolic devices; the author may twist the variation of the archetype in their story, but it still bears semblance to the archetype itself and other variations authors have used. One the oldest archetypes known to mankind is the historical fight between good versus evil. You know, the usual: the good side and evil side go up