backstory vs write-up

backstory

noun
  • A fictitious account of a person's history designed to conceal their actual history and motives. 

  • The previous life and experiences of a person, especially a character in a dramatic work, but also a real-life person. 

  • A prequel. 

write-up

noun
  • A written account of something, as a record. 

  • A review published in the print or online media for a film, book, etc. 

  • An increase made to the book value of an asset that was previously undervalued. 

How often have the words backstory and write-up occurred in a corpus of books? (source: Google Ngram Viewer )