I have been backing up with my sd gecko for the last 18 months.
From start to end, including the burning at 4x. It takes 90 minutes until I have the freshly burnt disc in the wii drive, ready to play.
Really, unless you're copying more than one game a day, 2 hours for the USB shouldn't be a problem, plus you don't have to get up and dump the chunks every 20 mins.
And if you're that cashed up that you actually have a new original to "back up" every day, I don't see why you'd even bother making copies.
21/07/2008
Brisbane, Queensland