he's running Win2K
he could share folders/files that he wants as a backup
you as in linux could access his system through samba
see here for more info:
http://www.dslreports.com/faq/943
HOWEVER, you would need a cheap hub and 2 RJ-45 cables to get it all setup in a network (total costs probably 30 bucks or less if you're good and know where to buy stuff cheap
) - remember, this is a purchase that is not just good for that one occassion - imagine you will have a second computer someday and want to have both systems connected to the internet
there ya go hehe
NOW!!! You asked for something that would work without a network - if you have 2 HDDS in your system and would like to help him, just add your second HDD into his system, boot up with his Win2K and copy all files he wants saved over to your second HDD ( you will need to know how to set jumpers and such for the HDDs to work properly - BIOS configuration is another thing you might have to look into)
second method: if he has a website hosted somewhere and it's not that much that he wants to backup, he should simply use ftp to log onto his webhosting and upload it there, that way it's convenient for him to redownload all of it when he's got his system backup properly
third method: buy another HDD - HDDs are very cheap today, I mean he doesn't have to purchase a 200GB HDD or so, probably a 30GB is enough for his backup and that way he can have his data always saved on a seperate drive which more "likely will" never be affected of any other problems.
I think that's pretty much all I can think off for rigth now
- hope this helps