backup meaning and definition

BACKUP noun

Definition of backup (noun)

1. an accumulation caused by clogging or a stoppage
   • "a traffic backup on the main street"; "he discovered a backup in the toilet"
2. someone who takes the place of another (as when things get dangerous or difficult)
   • "the star had a stand-in for dangerous scenes"; "we need extra employees for summer fill-ins"
   • synonyms: backup man, fill-in, relief, reliever, stand-in, substitute
3. a musical part (vocal or instrumental) that supports or provides background for other musical parts
   • synonyms: accompaniment, musical accompaniment, support
4. (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"
   • synonyms: computer backup
5. the act of providing approval and support
   • "his vigorous backing of the conservatives got him in trouble with progressives"
   • synonyms: backing, championship, patronage