Log in as an administrator with configuration privileges.
Stop Calendar Server services by issuing the stop-cal command.
Change to the directory where the ics.conf file is located.
Enable archive backups by setting the following ics.conf parameter to “yes”:
Specify the directory path for the archive directory.
The default is the current directory.
When you have completed editing the ics.conf file, restart Calendar Server.
The calendar services do not need to be stopped to edit the ics.conf file, but you must restart the services in order for the changes to take effect.