The phrase "a backup copy of" is correct and usable in written English.
You can use it when referring to a duplicate of data or files that is created to prevent loss in case the original is damaged or lost.
Example: "Before making any changes to the document, please ensure that you have a backup copy of the original file."
Alternatives: "a duplicate of" or "a secondary version of".
Make a backup copy of your code from the previous project, download the code from here portos2.zip, and merge.
Make a backup copy of your code from the previous project, download the code from here portos3.zip, and merge.
Your seemingly reasonable desire for a backup copy of your new software program or DVD may be your vendor's very definition of intellectual-property theft.
In any case, before removing the programs you should make a backup copy of personal files like your AOL address book and Personal Filing Cabinet.
After Ms. Stewart asked her to restore the message, she said, she was unable immediately to find a backup copy of the original but eventually did so.
The box also includes an option for making a backup copy of the.pst file before you start repairs, so make sure that checkbox is turned on.
It might also hold an emergency backup copy of a crucial document just in case your laptop doesn't survive a trip with you.
[UPDATE 11-12-14 2:30 pm and 5 25 pm: Functionality on that site appears to have been disabled 90 minutes after I posted this article. The links in the rest of this paragraph now go to screenshots we saved before we posted. Republic Report also made a functional backup copy of the scam site.] A visitor to the site is prompted to enter her chosen job and zip code.
Do you have a current backup copy of your data?
Now, in one of the most surprising developments to emerge from genetics in years, researchers at Purdue University are reporting that some organisms may carry around a complete backup copy of their own genomes.
If eLocust3 is being used, then there is no need to use this form unless officers wish to have a duplicate (backup) copy of the field data.
