What are some alternatives?
When comparing SmartSVN and JustCloud, you can also consider the following products
TortoiseSVN - The coolest interface to (Sub)version control
Dropbox - Online Sync and File Sharing
Slik SVN - SlikSVN is a free subversion client for the command line.
ShareFile - Secure file sharing and sync
kdeSVN - Comfortable graphical SVN client for linux.
ElephantDrive - backup solution for businesses and individuals