| 单词 | backups | 
| 释义 | backup1 of 2noun  back·up  ˈbak-ˌəp  often attributive 1  a    : one that serves as a substitute or support  I brought an extra pencil for backup. a backup plan  b    : musical accompaniment  The tunes include banjo and guitar backup.  c    : additional personnel who provide assistance  The police officer called for backup. 2   : an accumulation caused by a stoppage in the flow  traffic backup 3   : a copy of computer data (such as a file or the contents of a hard drive)  I made a backup copy of the file.  also : the act or an instance of making a backup  back up2 of 2 verb  backed up; backing up; backing up   intransitive verb   : to accumulate in a congested state  traffic backed up for miles transitive verb 1   : to move into a position behind (a teammate) in order to assist on a play   2   : hold back sense 1   3   : to make a copy of (a computer file or data) to protect against accidental loss or corruption  Be sure to back up your work.  also : to make copies of all the files on (a device)  a program that automatically backs up your hard drive  backups noun1 as in jamsa crowded mass (as of cars) that impedes or blocks movement there was the inevitable backup of travelers trying to pass through airport security Synonyms & Similar Words Relevance 
 2 as in replacementsa person or thing that takes the place of another you didn't get the lead position, but you can be the backup to the chosen singer Synonyms & Similar Words 
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