How do I save a disk image of my laptop hard drive?

[Mark Phillips]

I have a laptop that dual boots Windows and Debian. I need to make a complete 
backup of the entire drive. I have another Windows XP machine on my network 
(or another Debian machine) with some extra disk space, so I would like to 
create an image of the disk drive and store it there. I then want to restore 
it later. How do I do that?

I have been googling around for "hard drive backup" and "partition backup". I 
found a few options, tested them on the Window 200 partition, and they don't 
seem to be able to do the job. One problem I have is that Windows 2000 does 
not see the Linux partition and Debian does not see the Windows 2000 
partition. Based on what I read, I should unmount the drive I am copying - is 
this true?

I am not enough of a Linux guru to figure out how to use dd across the 
network. Can I run dd on the system I am imaging?

Can I do this with a knoppix CD? Is there a howto somewhere? I couldn't find 
it.

Thanks!

Mark