Sorry I don't know about uploading; maybe just use a free file hosting site and then post your links to uploads here?
As for DLing how about you try this disk also has alot of VMU games, inc homebrew and a VMU emulator that runs on the Dreamcast.
http://www.easy-share.com/1907538668/vmu backup cd.rar
Password: snesorama.us
I originally run this on my DC way back in the day, pretty much every game multiple saves, 100% complete all characters unlocked, save just before major / last bosses, stuff like that.
In fact I will DL this when I get back home (traped at my parents place due to flood water - Australia) Hope it works on NULLDC