You can save your Outlook calendar by backing up your entire Outlook personal folder files (.pst) or an individual calendar (.ics).

.pst Files

File format used by Microsoft Outlook to store personal information, including emails, contacts, and calendar events.

.ics

A file format used for sending meeting requests and tasks over email, also used for sharing calendar information.

Outlook Calendar

A calendar and scheduling feature within Microsoft Outlook that allows users to manage appointments, meetings, and events.