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    backup

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    backup
    back‧up /ˈbækʌp/ noun
    1. [countable] something that you can use to replace something that does not work or is lost:
        Always have a backup plan.
        a backup generator
    2. [countable] a copy of a computer document, program etc, which is made in case the original becomes lost or damaged:
        Make a backup of any work you do on the computer.
    3. [uncountable] people or things that can be used to provide support and help if they are needed:
        Army units can only operate if they have sufficient backup.
        a backup team
    4. [countable] American English someone who will play in a sports team if one of the other players is injured or ill
       SYN  reserve:
        a backup goalie
         
    THESAURUS
       ▪ help the things you do to make it easier or possible for someone to do something: Now that I’m working, the kids need to give me more help with the housework. | The book would never have been finished without his help.
       ▪ assistance help. Assistance is more formal than help, and is used especially about people giving official help: The police are asking the public for their assistance. | The project received financial assistance from the government. | Thank you very much for your assistance, sir. | He set up the business with the assistance of his two sons.
       ▪ aid help. Aid is more formal than help, and is used especially about money, food, medicine etc. that is given to countries or people that are in a very bad situation: Aid is being sent to areas affected by the earthquake. | The US spends billions of dollars on aid to developing countries. | Another driver stopped and came to his aid.
       ▪ support help and encouragement: Thanks to everyone who gave us their support. | We could not have won the case without your support.
       ▪ cooperation help – used especially when people, organizations, or countries work together to get things done, and show that they are willing to do this: a spirit of international cooperation | The cooperation of landowners was needed for the plan to succeed.
       ▪ backup extra people, equipment etc that can be used in case people need help: The officer waited for backup to arrive before making any arrests.