Backup is installed automatically on XP Professional, but not on
XP Home. If you have the complete XP Home CD, find backup on the
CD, in \ValueAdd\MSFT\NTBACKUP and install it yourself by
doubleclicking the file ntbackup.msi.
Backup files created in Windows 98 are not compatible with the
Windows XP backup program. However the full version of Backup
MyPC from Stompinc will do this.