Google Apps Directory Sync for Postini Services Administration Guide - Manual (Page 68)

Synchronization 71
Scheduling Synchronization
Once you have successfully run a manual synchronization, you can set up
automatic synchronization. Use existing third-party scheduling software to
automate synchronization.
In most cases, scheduling twice a week is recommended. The exact timing will
vary based on the number of users you have and how often you need to update
them. A large company with many users changing frequently may need to run the
directory sync utility daily, while a small company with few changes may not need
to run the utility more than once a week.
The exact method to schedule this task depends on the operating system in which
the directory sync utility is installed. In Microsoft Windows, use Scheduled Tasks.
In Linux or Solaris, use
cron . Steps for how to do this are listed below. You can
also use any other scheduling software that can launch commands from the
command line interface.
Microsoft Windows: Scheduled Tasks
In Microsoft Windows, schedule synchronization using Scheduled Tasks.
Note: These steps apply to most common Microsoft Windows configurations.
Scheduled Tasks is a third-party product and is not supported directly by the
Google (or Postini) team. In the event of a Scheduled Tasks issue, contact your
Windows administrator.
To schedule a task
1. In Control Panel, open Scheduled Tasks.
2. Double-click Add Scheduled Task.
-u, --users Do not analyze users.
Note: If you use this option, Google Apps
Directory Sync will not add, move or delete
users.
-v Display short application version information.
Option Values