XP has a backup program available, but it is without some conveniences which other programs have (which lead to many of us not using NTBackup and preferring something else).
Using NTBackup in XP - http://support.microsoft.com/kb/308422
Using XP Backup - http://220.127.116.11/search?q=cache:u1Ryg...+disk&hl=en
If you don't really care about backing up your O/S and programs, then the easiest thing to do is just periodically burn the graphics, emails, etc. to CD or DVD. OTOH, this is not a good method if you have a number of video files which you want to back up.
I use a program, Powerquest Drive Image, which backs up the entire O/S and all files. I use it less frequently now, but I always keep a base backup relating to a time period that I might want to go back to, for whatever reason. It also has an image explorer function that allows me to restore anything from it, any time...from individual files to entire system. If I were buying a new program for this purpose (mine is dating from 2001-2002), it would probably be Acronis True Image.
Regardless of what method you choose, be sure to read/understand the directions for using and the advantages/disadvantages of each. I've seen a number of complaints from users of NTBackup concerning the fact that it does not back up directly to CD/DVD. All the data that I read indicated that in the instructions, but I guess some persons don't read such.
Windows Backup Does Not Back Up to CD-R, CD-RW, or DVD-R Devices - http://support.microsoft.com/?kbid=315255
Backup Options - http://www.onecomputerguy.com/install/backup.htm
WindowsXP Tips, Installing NTBackup on XP Home - http://www.onecomputerguy.com/windowsxp_tips.htm