icloud not backing up my calendar

Hi carolynwesley,

Thanks for using Apple Support Communities. We understand your calendar isn't syncing to iCloud as expected. We're happy to help. Start with the steps to resolve calendar sync issues here:

1. Check the system status of iCloud Contacts, Calendars, or Reminders for services outages or connection issues.

2. If a reminder isn't showing up on some of your devices, make sure that your iPhone and iPad have the latest version of iOS or iPadOS, or that your Mac has the latest version of macOS.

3. Make sure that you're signed in to iCloud with the same Apple ID on all of your devices. Then, check that you turned on Contacts, Calendars, and Reminders in your iCloud settings.

4. Check that the date and time settings on your device are correct for your current location. 

See additional steps to take if this continues here: If your iCloud Contacts, Calendars, or Reminders won’t sync - Apple Support

Thanks.