My wife has been using the Calendar app on her iPhone to store many important events under a calendar in her Google account. That Google account stopped syncing with her phone months ago, but she has continued to add events under that Google account on her phone. Now she has many events that only appear on the phone. They are not visible on calendar.google.com.
I'm trying to restore the syncing of her phone's calendar events with Google Calendar.
I've tried restarting the phone and adding a test event and forcing a refresh, but that didn't work.
My next step is to delete the Google account from her phone and re-add it, but how can I first back up the locally stored calendar events so that we don't lose them?
I tried syncing calendars with iTunes, but iTunes doesn't let me choose calendars from the Google account - it only shows some default calendars like
Calendar that she doesn't use. I synced and verified in the Calendar app on her Mac that it did not sync the calendars from her Google account.
iOS 10.11.1, MacOS 10.12.6, iTunes 18.104.22.168