I have Unison running as a service on my media server at home. I use it to sync my external HDD with the music library using a Bat file and copy of Unison on the HDD. I'll post the configs from that when I get home to jumpstart your Unison setup.

Unison isn't difficult, but it takes a bit to get the hang of it if you haven't used Unix/Linux tools before.

Glenn
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Actually I am a Rocket Scientist! \:D