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From: Laszlo Nagy <gandalf@shopzeus.com>
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Subject: Re: Share folder over internet
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> Unless I'm very confused, BSD NFS can export directories and directory
> trees in addition to filesystems.  See export(5).  Internet security
> should be attainable with an appropriate firewall configuration that
> allows the servers to only talk to each other.
>   
IMHO you can export directory trees (-alldirs option), but if you do 
that then you can list each file system in /etc/exports only once. So it 
is impossible to export some (different) directories from a filesystem, 
but not others. But again, this is not a big problem when I use a VPN 
connection between the two file servers only.

Coda is looks VERY interesting! :-) Two key features:

"high performance through client side persistent caching"
continued operation during partial network failures in server network

Promising. I'm going to try it and let you know how it goes.

Best,

   Laszlo