Bedeutung von “backup” im Essential American English Dictionary

backup

noun us /ˈbækˌʌp/

an extra copy of computer information:

Have you made / a backup of that document?

extra help, support, or equipment that is available if you need it:

Medical staff are available to provide backup in an emergency.
Keep extra batteries for emergency backup.

(Definition von “backup” aus dem Webster's Essential Mini Dictionary © Cambridge University Press)