back up copy

基本解释

Did you make a back up copy?
你做了备份文件吗？
Many software companies make an express provision for the user to make one back up copy .
许多软件公司明文规定要求用户进行一次副本备份。
Save a back up copy somewhere before you do any edits!
在你做任何编辑之前，在某个位置保存一个文件备份。

If you've somehow held back from picking up a copy of your own, you'll be glad to know that pretty much everyone in existence agrees that this film rocks.
ENGADGET: Iron Man Blu-ray review roundup HD
Can you please put it back up or send me a copy?
FORBES: Readers Say
But I do worry that some day the cloud fairy will turn into the wicked cloud fairy of the west and start charging me for every post, or that the cloud will burst and my data will become inaccessible, which is why I keep a copy of everything I post on my own server (and then I back that up).
FORBES: Cloud Computing: Who is Picking Up the Check?