High Quality Content by WIKIPEDIA articles! DirSync Pro is an open source synchronization and backup utility for Windows, Linux and Mac OS X. The first version was released in February 2003 and the application has been in active development since then. DirSync Pro offers a graphical user interface from which the user can manage and run multiple synchronization tasks. As of version 1.21, it supports local folder to folder synchronization, but does not support synchronization via FTP. The application is self-contained within its own directory, and is therefore fully portable.