R2D2 relays historien till Whills, så kan inte hans minne torkas.
I De antecknade skärmbilderna för den ursprungliga trilogin George Lucas säger
Originally, I was trying to have the story be told by somebody else (an immortal being known as a Whill); there was somebody watching this whole story and recording it, somebody probably wiser than the mortal players in the actual events. I eventually dropped this idea, and the concepts behind the Whills turned into the Force. But the Whills became part of this massive amount of notes, quotes, background information that I used for the scripts; the stories were actually taken from the Journal of the Whills."
Så det verkar som att tanken var att Whills var bortglömd.
Men i Göra Star Wars Revenge of the Sith verkar det som om tanken återställdes som den indikerar att
The events surrounding the life of several members of the Skywalker family were recorded in the Journal by a Keeper of the Whills, after an interview with the Astromech droid R2-D2 one hundred years after the Battle of Endor.
Jag äger inte någon bok så jag rapporterar bara vad som finns på wookiepedia, men du kanske finner att det finns mer detaljer i Making of Star Wars Revenge of the Sith .