Open English Wordnet
Nouns
(n)accompaniment, musical accompaniment, backup, supporta musical part (vocal or instrumental) that supports or provides background for other musical parts
(n)backup, computer backup(computer science) a copy of a file or directory on a separate storage device“he made a backup in case the original was accidentally damaged or erased”
(n)backing, backup, championship, patronagethe act of providing approval and support“his vigorous backing of the conservatives got him in trouble with progressives”