If you have not yet configured backup at all, go to
http://help.live.com and select Windows Live products and services, then Windows Live OneCare. In the search box, type "configure backup" to see various topics that will help you.
The topic that serves as a good starting point is:
Create a backup plan
To help avoid losing important data, you should create a backup plan (A collection of backup settings in Windows Live OneCare that you can choose from to select the types of files that you want to back up, the location where you want to store the backup, and how often you want to run the backup.) to back up your files regularly. You can create a separate plan for individual computers, or create a plan that uses a central backup device (The backup files are stored on a central device that all computers in a OneCare circle can use.) for all the computers in your OneCare circle (A small network of computers that share the same Windows Live OneCare subscription.) . You can create a plan that uses a central backup device only from a hub PC (A computer from which you can monitor or manage the other computers in your OneCare circle.) .
If you have already created a plan for your Circle, using Centralized backup to that external drive connected to the Hub PC of your Circle, you need to revise the backup plan and configure backup on the Hub PC for the additional PC.
-steve
Microsoft MVP Windows Live / Windows Live OneCare, Live Mesh, & MS Security Essentials Forums Moderator
