Excerpted from the website of The Elder Geek:
<snip>
Install Backup on Windows XP Home Edition
Users of XP Home Edition that have tried to back up their
systems may have been surprised to find that the Backup
utility is not included in the default installation of
Windows XP Home Edition. No Backup icon is present on the
Start menu in Windows XP Home Edition, nor is Backup
listed in Add Remove Programs for Windows XP Home
edition. No mention of the utility is made anywhere
during the installation, but it is included with Windows
XP Home Edition. It's just necessary to do a manual
install to prepare it for use.
To Manually Install the Backup Utility
Insert the CD Rom and navigate to CD-ROM
Drive:\VALUEADD\MSFT\NTBACKUP
Double-click the Ntbackup.msi file to start the wizard
that installs Backup
When the wizard is complete, click Finish.