If you have a Google account, you can save Google documents easily to your Google Drive. It's simple, only 3 steps!
Right-click (using your mouse) on the file you want to copy. You will see a list of items appear.
By clicking "make a copy," you will create a copy of the file. It will automatically appear in your drive under the name "copy of (file name).
Your file is now all yours. No one will have access to this file unless you personally share it. Also, you can now edit your file or change it as needed.
If you want more information on how to use all the great stuff Google Drive or Google documents offers, click here: Google Help