Cal Backup is an AppleScript application that backs up Apple's iCal calendar files according to user specified preferences. This augments your regular backup strategy by allowing you to target iCal files for backup more frequently and for fast and simple restores.
Once configured, iCal Backup runs as a companion to iCal and silently backs up your calendars only when the calendars have changed since the last backup.
What's new in iCal Backup
Corrected a bug that caused an internal error on the next backup when a calendar was renamed or deleted.
Corrected a bug reported by Ivan B. that caused an internal error when calendars had some special characters in the title like single or double quotes and '~'.