if you copy and paste something...

The data that remains on the clipboard is not substantially large and I don't know of any point in time where it would take up more than a few kilobytes on your hard drive if it's not stored in the virtual memory. The only thing I can say I've run into is some issues with Microsoft Office 2000 storing its own clipboard information for longer than it needed to, but thankfully that seemed like it was fixed with the Office 2003 release.
 
It doesn't actually copy the file until you paste it somewhere. When you right click and select "copy", it's basically just telling the OS that you will be duplicating a file, it doesn't store it anywhere temporarily.
 
yes and then when you paste it does it take up an additional 3 megabytes or so on the hard drive as the original file does?
 
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