You can't gvfs in iOS/Android/Windows/OS X And FTP port is not as ubiquitous as 80/443 Your FTP server availability is always worse than Dropbox's EC2 cloud.

You can't gvfs in iOS/Android/Windows/OS X And FTP port is not as ubiquitous as 80/443 Your FTP server availability is always worse than Dropbox's EC2 cloud. FTP has account/mask/chmod/filename encoding problems You have to backup your data on server and resolve file name conflicts in some odd way. The list goes on.