How can I sync Mac Calendar with my own server? Not one of Google, not one of Apple, iCloud. But my own.

  1. Launch System Preferences
  2. Select Internet Accounts
  3. Select Add Other Account…
  4. Select CalDAV account

You can then configure the calendar to synchronise with. The calendar must support CalDAV to work with macOS.

Internet Accounts showing CalDAV option on macOS

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