We don't know when our hardisk will become failure or when our computer attacked by the virus, important files may lose if it happend.
As the Cd / DVD burner is become popular now. I would recommend to backup the files in the CDR / DVDR / CDRW / DVDRW or other media regularly. ( Removable hardisk is most stable, DVDRW is most cheaper )
Abakt (A Backup Tool) -
http://www.xs4all.nl/~edienske/abakt/index.html
After some searching, I found this useful freeware, it can backup our files to a zip file, I like zip format because it can be easily be extracted in other computer.
If you want to backup to DVD/CD RW directly, you have to format it by using InCD or other tool.
If your data is more than 4GB, you have to select the 7-zip as the backup format. I found 7-zip is quite slow, anyone facing the same problem?
This is the most complete zip / 7-zip backup solution I found, if you know other freeware which can do the backup job better, I would appreciate you can share with us.