Getting your backstory right can propel your story (and your readers) forward into the depths of your story armed with all the information they need. Getting it wrong can bog your story (and your readers) down enough to cause it to grind to a horrible, screeching halt.

Reveals how Dumas balanced the backstory in The Three Musketeers to give readers just the right amount of information at just the right moment.

Source: Boring! How to Diagnose Your Bad Backstory – Helping Writers Become Authors