Java not working/How do I use DirSyncPro?

Hey guys.

I recently acquired a 3TB external hard drive and would like to set up a system that will copy file-by-file new/modified files to the external, but if I delete them off my main iMac it will not delete it off my external.

I was told DirSync Pro would do this nicely, and from the look of it on screenshots it seems adequate. However, I cannot manage to get it to run!

I've tried the directions by punching in a command in Terminal, but I get an "unable to access jarfile" error. Double clicking the .jar file does nothing (seems I don't have Jar Launcher??)

Google brings up nothing useful about the errors I'm getting.


Otherwise, is there an easier-to use method/software out there? Carbon Copy Cloner doesn't seem to work, the drive is NTFS format.