I suggest you learn to use the detach and reattach facilities in 'screen'. e.g. http://www.rackaid.com/resources/lin...al-and-how-to/
You can detach the process running the copy and logout from your ssh connection. You can reconnect and reattach to the copy process. You can also open another shell to look at the progress of the copy process.
If you have typed a command and want to save it in a file, you can simply hit the up arrow key to bring back the command, then edit the line to 'echo "<your command>" > <your file>'.