Yes, Dropbox PROHIBITS employees from trolling files. I'd be a whole like happier if they could say PREVENTED though.
FTP servers are fine, but they don't synchronize. That's the appeal of Dropbox, Sugarsync etc. You can probably setup an FTP command to copy only changed files up, then down, on both a PC and an eDGe, but if you that big a geek, you'd write your own synch program.
Anyone with a domain name can generally store data, even without hosting or a website.
Those online synch systems would be really cool if they'd do in-file Deltas!