How can Almost Empty Dropbox folder Take 1.3 GB Space?
In the end after taking 3 backups of the system, I deleted the Dropbox Directory because


Dropbox can backfire and delete files/directories in local system if symlinks are used to Dropbox
Dropbox messes up OS X Extended hierarchy and takes significant amount of spaces although Dropbox uninstalled; I do not understand the details here. 


I noticed surprising effects although I had deleted Dropbox application. Diskutility showed me 15 GB free space before the deletion of Dropbox Directory. I restarted my system many times to see if the case is really true. After removing Dropbox directory, I got 50 GB free space as I should. Dropbox is clearly messing up the filesystem more than many know. 
Replacement of Dropbox


VPN connection in router because software VPN unstable (at least NordVPN crashes all the time; TODO Tunnelblick) in OSX; software VPN in Ubuntu Linux 14.04 (not newer because systemd/upstart problem with runit) next to OSX installation
Goal to use Bittorent Sync with VPN [experimenting]. It experienced conflicts with Dropbox and my local ISP/governments because they block/obstruct torrent protocol. 
... [hope more comes here] ...