If yoy have firewire or fast USB on your machine I would consider just getting another hard drive that runs on one of those and making the backups that way.
If you have a DVD burner then I would also consider that.
Backing up over DSL can take a very long time, especially if your high speed is only for downloads and not uploads. I get a meg for my download speed, but usually about 110k for the upload speed, so for me backing up over my dsl configuration is about twice as fast as dial up. Not a good idea.
You can get an 80 GB USB hard drive (either 1.1 or 2.0) with backup software for $140 at places like computers4sure.com
http://www.computers4sure.com/produc...445107&iid=939
which will be way faster then using the internet, and you control the data, not somebody on the other side of the internet.