From time to time, I got emails from paid/prospect customers of Gmail Keeper asking if Gmail Keeper can backup their Google calendars, but unfortunately the answer is no (currently).  For now Gmail Keeper can only reads emails from your Gmail and Google Apps accounts and save them to disk and then zip them, it does not read Google calendar data.

Will Gmail Keeper support backup Google calendar?

Answer:  It depends on  how many requests for Google calendar data backup will I still get in the future.  Or if I start using Google Calendar myself, maybe I’ll need to find a way to backup the calendar myself

Another question I need to consider is that how to store and view the calendar data locally, let me know if you have any comments.