This is usefull for users who work with a laptop or usb key but may interest also users who want making differential backup to gain time.
Install Synchrorep in Ubuntu
Preparing your system
Note:- You should be running ubuntu version 8.10 and above
Install following packages
sudo apt-get install python python-pysqlite2 python-gtk2 python-nautilus
Now you can download .deb package from here
Install the downloaded .deb packge by double clicking on that or run the following command from your terminal (Make sure you are in correct path)
sudo apt-get install synchrorep-1.3.6.deb
You can start Synchrorep by right click on folder to synchronize.
You can check more screen shots from here