The most important things to remember about back story are that (a) everyone has a history and (b) most of it isnโt very interesting.
Stephen KingThe first movie I can remember seeing was The Creature From The Black Lagoon. And, I can remember hearing a radio play of Ray Bradbury's Mars Is Heaven. And when I cut my teeth on comic books, they were not the easy ones of today like Spiderman, Superman and The Hulk. they were Tales Of The Crypt, The Vaultkeeper, and that sort of thing.
Stephen King