Diagraphephobia

Diagraphephobia is the fear of being deleted. It can also be believing that you are living inside a video game or computer simulation, and being afraid that you are going to get deleted from existence. Also applies to the fear of having your important documents, photos, or other files deleted and living as a file, photo or a document inside a computer.

Trivia

 * Despite having it's namesake related to a song in the Wii Deleted You Friday Night Funkin mod, Diagraphephobia does not have any correlation to Friday Night Funkin' or the Wii Deleted You creepypasta, other than the song going by the same name.
 * Actually the fear does relate to the creepypasta and mod, as the main antagonist, Eteled does the things he does in the mod and creepypasta out of the fear/hate for being deleted.
 * For clarification both the mod and creepypasta's story revolves around the idea of a mii character named Eteled being trapped inside a haunted wii and though he can come back after deletion, it physically and mentally pains him, so that he won't be deleted he purposely scares and disturbs the wii owner as a punishment, if deleted.