Love the AI addition. From https://www.reddit.com/r/ProgrammerHumor/comments/1p204nx/actuallycompleteversion/
A BACKLOG was originally just that—a large log placed at the back of a fire, to direct the heat outwards and prolong the burning. In the sense of something set aside for later, the word came to be used of a ‘backlog’ of unfinished work in the early 1900s.