The file structure for Moodle 2 is very different from 1.9, so it may not be possible to do what you want -- but I'm no expert. With luck, someone will be able to tell you how to do this in Moodle 2.
However, what you could do is set up your own Moodle server on your personal/office computer, then backup the Moodle courses online and restore them to your local host system. Then you can delete them from the pay-for server while still having access to the marks etc when you need them. This may be using a sledge-hammer or wrecking ball to crack a nut, but the nut will be cracked.
Anne