SuperDuper! 2.5 is finally out, and it's compatible with Mac OS 10.5 (Leopard). The first thing I did when I arrived at home last night is to start backups of both my desktop and notebook to a NAS box over gigabit. Check out what SD is reporting as effective speed.
1.96MB/s is hardly "effective"
This is over a gigabit network. When I go direct file copies to the same NAS box, I get average write speeds of around 30MB/s.
I still believe that file operations over Mac networks are broken.