Backlog is a joint compilation album between by electronica musicians Leftfield and Djum Djum, released in 1992. It contained mixes of Leftfield's first two releases "Not Forgotten" and "More Than I Know" from between 1990 and 1991 and two mixes by Neil Barnes of the Djum Djum track "Difference". It was released on CD in December 1992 on the Outer Rhythm label. Djum Djum is the stage name of rapper Neil Cole.