It's heavily used over VPNs. I have seen SMB over the internet by [ill-advised] companies but the various waves of exploits have probably put an end to that.
The main point was just that something like SMB or NFS is not a good fit for a network which is not extremely fast and highly reliable because too many programs do blocking I/O. Dropbox works really well in that situation because it's asynchronous and that advantage was huge when they came out because everything was even worse back in 2007.
The main point was just that something like SMB or NFS is not a good fit for a network which is not extremely fast and highly reliable because too many programs do blocking I/O. Dropbox works really well in that situation because it's asynchronous and that advantage was huge when they came out because everything was even worse back in 2007.