During my career as a writing coach and editor, I’ve answered many questions about when to use backstory, so you might find my article, ‘BACKSTORY: Relevant Information or an Inconsequential Event?” helpful. Hope so!
A Writer’s Path, an online writers’ site, published it yesterday
I had such an enjoyable Tuesday evening; I was invited to speak at a local book club about my vigilante novel, WITH FULL MALICE. A member read it and recommended it to the group. Then they invited me to visit.