In addition to syncing your calendar to an external device or calendar, you can also export your calendar in CSV format.

From the top menu go to Scheduling > Calendar Report(s). You can set the date-range you're interested, the providers/rooms you want to include on the export, and also filter by appointment-type or status:

Note that if you open this report from a patient's chart you'll have the option of only downloading appointments for that calendar. Also, if you're trying to audit deleted schedule items you can check the box in the bottom right corner before pressing the Download Report button.