SFS status and other

Hi:

I've read out there in a presentation titled "File Sharing over the Internet
with SFS" of 11/2001 that SFS uses LBFS as the "SFS dialect for slow
networks".
Is this true now? Does SFS still use LBFS? I think I read also that it is
using NFS as the communication protocol.

I also wanted to know if SFS is suitable for WAN networks, and if it is too
far from "production" quality.
I'm interested in LBFS because I plan to use a filesystem with a low
bandwith connection to the Internet (64Kb). I would also appreciate if you
have any suggestions about this or other filesystems.

Thanks,
Juan Carlos