Did ABBA have a backup band?

No, ABBA did not have a backup or touring band. The band consisted of four permanent members: Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. For live performances and studio recordings, they were supported by a group of session musicians known as the "ABBA orchestra" or "ABBA band." These musicians were hired on an as-needed basis and did not tour or perform with the band on a regular basis.