Sometimes new writers overdo this. A small amount may be necessary for your reader to understand what's going on, but that's it. Period. Save it for later with action, dialogue and narrative.
When agents and editors open their e-mail, and read page after page of backstory, I'm afraid that could be the kiss of death for you manuscript. Tread lightly when using backstory. Learn to trust and give your reader credit for the intelligence they have.