Most of the data for each calendar (maybe not all) is contained in the calendarscript/calendars/
Calendar_Name directory. I would think the easiest method to ensure all data is maintained would be to compress (tar/gzip, zip, etc.) all the CalendarScript files and directories in place then download that compressed file to a local storage area.
You'll have to check with your host to see if you have such compression utilities are available on their system or if they are willing to do such archiving for you periodically.
JMO
Dan O.
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Everything Else
