backup汉语翻译：
n. 倒车, 后退, 后援, 支持, 阻塞
vt. 做备份
a. 候补的, 支持的
【计】备份; DOS外部命令:通常使用于将硬磁盘上指定的文件复制到软盘上英语解释：
名词 backup:

an accumulation caused by clogging or a stoppage

someone who takes the place of another (as when things get dangerous or difficult)同义词：stand-in, substitute, relief, reliever, backup man, fill-in

a subordinate musical part; provides background for more important parts同义词：accompaniment, musical accompaniment, support

(computer science) a copy of a file or directory on a separate storage device同义词：computer backup

the act of providing approval and support同义词：backing, championship, patronage

详细解释：
back.up
n.（名词）
A reserve or substitute.
改变或替代
Computer Science A copy of a program or file that is stored separately from the original.
【计算机科学】备份：从原文中独立出来单独贮存的程序或文件的副本
Support or backing.
支援或支持
Music A background accompaniment, as for a performer.
【音乐】伴奏：为一个演奏者配音伴奏
An overflow or accumulation caused by clogging or by a stoppage:
阻塞：由阻碍或停顿引起的泛滥或堆积：
例句：
a backup in the sink; a backup of traffic at the drawbridge.
下水道堵塞；吊桥上的交通阻塞
adj.（形容词）
Extra; standby:
额外的；替补的：
例句：
a backup pilot.
候补飞行员

backup是什么