Back It Up!! is a promotional "live" album initially released in 1975 to promote Nil's first solo album after his stint in Grin which had been released earlier that year.  Although the recording was officially released by A&M Records, the artwork was designed to give the appearance of a live bootleg recording. The songs were recorded at the Record Plant in Sausalito, California, on October 31, 1975.  Interestingly, Al Kooper is a guest on keyboards.