FireBean

Hey peeps! I'm new to running a voltz server and I cannot for the life of my figure out how to update it to the latest. My buddies want to be on the latest and I keep killing our world. I've made a back-up of the voltz server folder. Is there guide somewhere that will show to the proper way to update Voltz and not loose all the work we have done in the world? If it helps, the server is running on a Debian distro. I have used search and just cannot seem to find the answer I'm looking for.