A backup is both more and less than a Sandbox. You can't substitute one for the other.
You'll want a full backup. But, when installing updates, you can try them out on the Sandbox. Even if you run for a while and make changes to your files, you can "uninstall" the update by simply booting back to your original drive. All your user files changes will still be there -- which isn't true with a backup.
Make more sense?
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--Dave Nanian
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