How to export Google Calendar(s)
There are two ways how to export Google Calendar. You can export a specific calendar or export all calendars currently available in your Google account.
Export Google Calendar (single) by following these steps:
Step 1. Open your browser and go to www.google.com/calendar, login to your Google account (if it's required) and locate your calendars list on the left side of the page. Hover your mouse over the calendar you want to export, click the 3 vertical dots button, and select Settings and Sharing.
Step 2. Once in Calendar Settings, click the Export calendar button and a .zip file will be downloaded to your system containing an .ics format file of your calendar.
Export Google Calendar (multiple) by following these steps:
Step 1. To export all calendars in the list click the Gear icon top right corner of the Google Calendar page and select Settings.
Step 2. In the Settings page look on the left side of the page and choose Import & Export option.
Step 3. In the Import & Export settings page click the Export button and a .zip file will be downloaded containing all the calendars in .ics format.