Data on 4 of 5 calendars disappeared. Apple support could not help either on phone or in person at store.  I thought the info was backed up, but it was not.  The data is gone, but I still wonder what happened.

Data on 4 of 5 calendars on ical covering dates from 1/1/2013 through 1/22/2014 simply disappeared.  Apple support could not offer an explanation, after two hours on the phone, and over an hour at the Apple store (genius bar).  I thought the data was backed up, but data for the same dates was also missing from my external hard drive.
All the information prior to 1/1/2013 and after 1/22/2014 still exists, along with dates into the future.  The missing data apparently no longer exists anywhere, but I am curious as to what may have happened, and is there something I can do to prevent it from happening again.  Backing up on an external hard drive is obviously not the answer.

Have you tried resetting Calendars in iCloud ?
If not, open System Preferences > iCloud
Deselect the box next to Calendars then reselect it.
Give iCloud a few minutes to re sync the data if it can.

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