Which will take longer?

this post might repeat a few other questions, but i am just looking for a little clarity from the gurus.

There are two paths to backups
1. download bin/cue files and burn with cdrwin
(need a boot cd for these, right?)
or
download cgi files and burn with disc juggler

2. interface the dreamcast to the computer and use the dreamcast as a GD reader then edit files if necessary and burn.

I only have a 56k modem and downloading 800MB+
will take quite awhile. once i have backed-up using method 2 a couple times will it be easier/faster than downloading?

Thanks for any help