Although the Backup utility can be installed manually from the XP installation CD-Rom (assuming it's a full CD; don't know about OEM disks), the ASR portion doesn't work on XP Home.
Also, the original poster should keep in mind the difference between imaging and backup. If you image the disk regularly, then you can restore the image and it will restore XP, all applications installed, and all files and data, exactly as they existed previously. If you only do file backup, then if your hard drive dies, you'll have to reinstall XP as well as all your drivers, applications, etc., before restoring your files from the backup. Imaging is a much better solution, imho, as anyone who has had to reinstall windows and all applications will attest.
Acronis True Image 9.0, www.acronis.com (free fully-functional trial download available) is a great choice.
No connection to the company, just like the product.