The first thing you will want to do is make sure you have all of your known appointments, meetings, and functions entered into the calendar. Now when you are ready to save click on File Export. This will bring you to the Export Dialog box. Just choose a location to store the *.ics file. ICS standard is a text standard developed by Apple for easy importing of calendar text data.
*Save the file on removable media such as a CD or Flash Drive and bring it to another computer to import to other calendar utilities!
Now we can import this file into many types of online calendar applications such as Yahoo or Google Calendar. As an example I will show you importing the saves Window’ into Google Calendar.
Navigate to your Google Calendar and click the Add dropdown box and Import Calendar. Enter in the location of the backup calendar and click Import.
Another thing to remember is the ICS file is a snapshot of the calendar. This means any changes you make will not automatically be saved to the file. If you rely on your calendar heavily make sure to back it up regularly.