备份的英文：
back-up
backup copy

参考例句：
  • Backup copy
    备份拷贝
  • The backup Javascript configuration file was absent or had errors.
    以前备份的Javascript配置文件不存在或有错误。
  • The backup failed. Check the directory where you are backing the database.
    备份操作失败。请检查您备份数据库的目录。
  • To back up tiles is tedious work
    把文档备份是一项枯燥无味的工作。
  • Single Instance Storage is not available on this volume.
    零备份存储在这个卷上不可用。
  • Always keep a copy of everything in your own files.
    要时刻牢记把所有文件都备份。
  • The backup automatic configuration file had errors.
    以前备份的自动配置文件有错误。
  • Even travelling between the three requires massive military back-up.
    而在这三处地方旅游甚至都要做军事备份。
  • This is the Mac utility for automatic backups and restoration.
    这是个Mac自动备份和恢复工具。
  • Unable to install Netscape MAPI support because the backup of "XX" failed.
    无法安装Netscape MAPI支持，因为在备份"XX"时失败。
back是什么意思：
n. 后面，背面，反面；背，背部；靠背；后卫
v. 支持；后退，倒退；背书；下赌注于
adj. 背部的；后面的；过去的；拖欠的.
adv. 以前；向后地；来回地；上溯
  • Stand back to back!
    背靠背站好！
  • They are on the back of the menu.
    它们在菜单背面。
  • Our seats on the train were back to back.
    我们在火车上的坐位是背靠背的。
backup是什么意思：
n. 支持，后援；备份；阻塞
adj. 备用的，候补的；支持性的；伴奏的
  • There's a backup of traffic at the drawbridge.
    吊桥上交通阻塞。
  • This is the backup commissarial list.
    这是候补委员名单。
  • They're your backup singers.
    他们是你的伴唱团。
copy是什么意思：
n. 复制品；摹仿；一份；稿件
v. 抄写，复制，复印；抄袭；模仿
  • He was punished for copying.
    他因抄袭而受处分。
  • A set of five copies.
    一式五份一套五份复件 。
  • Copy this page in your notebook.
    把这页抄写在笔记本上。

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