Backup | Mean of backup in English Dictionary

/ˈbækˌʌp/

• Noun
• a person or thing that can be used to replace or support another person or thing
1. His role on the team is to be a backup to the regular quarterback.
2. We have an extra radio as a backup in case this one doesn't work.
3. a backup quarterback
4. We need a backup plan in case of emergency.
• help or support provided by additional people or things
1. The policeman called for backup [=called for other police to come and help him] because the suspect was carrying a gun.
2. We have an extra radio for backup.
3. He provides backup for the regular quarterback.
• a situation in which the flow of something (such as traffic) becomes blocked
1. There was a traffic backup [=(Brit) tailback] for miles on the road because of the accident.
2. There was a backup [=blockage] in the drain.

• a musical part that is sung to support the main singer
1. She sang backup on his CD.
2. a backup singer
• a copy of information stored on a computer
1. Be sure to make a backup of your work.
2. a backup file/copy
• the act or process of making such a copy
1. It may take some time for the backup to be complete.