backup battery[电] 后备电池;后备电池;备用电池;主板电池
backup file[计] 备份文件;备用文件;备份档案
incremental backup增量备份;增量式备份;递增备份
Backup Plus新睿品;升级版;希捷移动硬盘
Backup Liu刘备
backup land后勤土地;预留地
backup types备份类型
daily backup每日备份;日备份;快速生成备份数据光盘;日常备份
Automatic Backup自动备份;数据备份
N-VAR（有变体名词） Backup consists of extra equipment, resources, or people that you can get help or support from if necessary. 后备 (设备、物资或人力)
There is no emergency back-up immediately available.
没有立即就能获得的后备。
N-VAR（有变体名词） If you have something such as a second piece of equipment or set of plans as backup, you have arranged for them to be available for use in case the first one does not work. 备用物 (如设备、计划)
Every part of the system has a backup.
这套系统的每个部分都有备件。
N-COUNT（可数名词） The backup of a song is the music that is sung or played to accompany the main tune. 伴奏; 伴唱
Sharon also sang backup for Barry Manilow.
莎伦还为巴里·马尼洛唱了伴唱。
N-COUNT（可数名词） A backup is the same as a . 后援 [美国英语]