The phrase "back story" refers to the history or background information that a person, place, or thing has. It helps provide context and understanding about a particular situation or character. Full definition
It will be some time before the full back story of this debacle will be known. (slaw.ca)
So this post is going to be a bit of back story on the house, and in the next few posts I'll share our inspiration pics and floor plan. (domesticimperfection.com)
First, a bit of back story for this recipe: A little while ago I became obsessed with the idea of having a Secret Recipe. (raegunramblings.com)