The term "backer" can refer to several different meanings depending on its context.
1) In music, a backer is someone who provides financial support for an album or recording project in exchange for rewards such as exclusive content or merchandise.
2) In the world of business and finance, a backer refers to an investor who provides funding for a new venture or project.
3) In sports, particularly football, a backer is a player positioned behind the line of scrimmage whose role is to block opposing players from reaching the ball carrier.