backup /ˈbækˌʌp/noun 7adjective 3forms 1 noun7 •an extra copy of computer files, kept apart from them, to use if they are ever harmed or lostAfter the power failure, we had to restore the database from backup. •A reserve or substitute.If the goalkeeper is injured, we have a backup. •Reinforcements.He's got a gun! You'd better send for backup. •Any support or extra help. •Accompaniment.Debbie Ahn, on piano, provided some mesmerizing back-up and many fiery, on-target solos. — 1984 •Corroboration. •An accumulation of material caused by a (partial) obstruction or (complete) blockage of the flow or movement of the material, or an accumulation of material that causes an overflow due to the flow being greater than the maximum possible flow.The accident caused a mile-long backup on the highway.The blockage caused a backup in the plumbing. adjective3 •Standby, reserve or extra.I am only a backup player. •That is intended as a backup.Make a backup copy of that file. •Supporting, reinforcing; (music) of or related to accompaniment formsbackups
