At a command line, change to the directory where the ics.conf 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.