B2 [ C or U ] (someone or something that provides) support or help, or something that you have arranged in case your main plans, equipment, etc. go wrong后备人员;候补物,替代物,备用物
B2 [ C ] a copy of information held on a computer that is stored separately from the computer(文件的)备份
[ C ] US a player who plays when the person who usually plays is not available替补队员
More examples
The paramedic who arrived first at the scene immediately called for backup.
How can I run the pub on my own all evening without any backup?
It is essential to have backup when you go diving, in case anything goes wrong.
If we run out of sandwiches I've got some pizzas in the kitchen as backup.
My neighbour came along to provide some backup, in case the youths gave me any trouble.
supporting the main singer, performer, etc. 伴奏的;伴唱的
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