back up copy

基本解释

Did you make a back up copy?
你做了備份文件嗎？
Many software companies make an express provision for the user to make one back up copy .
許多軟件公司明文槼定要求用戶進行一次副本備份。
Save a back up copy somewhere before you do any edits!
在你做任何編輯之前，在某個位置保存一個文件備份。

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?