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The backup facility is not installed with Windows XP Home; it has to be installed later from the disk as an "extra" or "tool" or whatever it is called. In other words, it and several other programs are on the disk as extras but not as part of the basic operating system.

My understanding is that if you were to go out and purchase a copy of XP Home, and install it on your machine, it would not automatically install these "extra" programs. They reside separately on the disk and must be separately installed, if desired. XP Pro however does have the backup tool built into the standard installed version.