名词 backup:

1. an accumulation caused by clogging or a stoppage

2. someone who takes the place of another (as when things get dangerous or difficult)

3. a musical part (vocal or instrumental) that supports or provides background for other musical parts

4. (computer science) a copy of a file or directory on a separate storage device

5. the act of providing approval and support

backupn.后备backup ared后备存储区backup path后备路径backup roll支承辊backup yard后勤场地backup file备份文件backup line后备水带backup tape备份带, 后备带backup ring垫环backup land预留地; 储备用地backup lamp前照辅助灯,(英:reversing lamp)倒车灯

1. Make backups of all of your files.
   备份所有的文件。
2. Run either manual or automatic backups.
   运行或者手动或自动备份。