there are 2 ways:
1) hard way - upload your saved files to Dreamcast usin' the built-in modem
(don't know much about this trick)
2) easy way - buy a Nexus VMU + cable, like this one
http://www.lik-sang.com/info.php?cat...oducts_id=499&
It's really cheap and you can upload saves to your hard drive (or download)
I'm usin' this VMU and I never had a problem.