As part of a good backup strategy, you should always have more than one version of your data. Even though you may backup all of your data to a Time Machine disk, disks do fail and you could risk losing all of your data.

A good practice then, is to back up your data to multiple Time Machine disks. With Mountain Lion, you can use a rotation of several disks, ensuring that if one disk fails you won’t lose everything.

To Set Up Multiple Backup Disks in Time Machine

1. Click  from the menu and click System Preferences.
2. Click Time Machine under the System category.
3. Click the Select Disk button.
   
4. Click the disk you want to use under the Available Disks area of the window.
5. When asked if you wish to use both disks or replace Time Machine, click Use Both.
   

You will now be able to rotate Time Machine disks.

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