It looks like there is an outstanding feature request for functionality close to what you are desciribing.
To my knowledge there is not a supported backup method other than iCal.
Thanks, Daniel. I also raised a Support Request and got a similar answer...that currently iCal is the only option if you want to back up *only* the calendar data.
Thanks also for the link to the JIRA issue. I took a look at it and it isn't really what I'm looking for here, but I'm definitely all in for better tools to manage past events!
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