Dear K Kilbane,
Once you have created the spring version, back it up and then restore it to a new course for the winter to keep them separate. Or a cleaner solution would be to use groups in 'separate groups' mode, then gradebook etc. can be told to display the data for each session - please see http://docs.moodle.org/en/Groups
I hope this helps, regards,
Courses and course formats
One course page - different groups using it in succession
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