Quote by Carmenica_Diaz
A tip.

When you are writing the story, begin two documents in your word processor - one for the main story, the other for the back story.
When you have finished the story (which should be fast and action packed), you then add the pieces of back story that are necessary.

Sometimes, you can gove the reader far more detail than they need.

BTW, much prefer to tell the backstory through dialogue.