If you want to unpublish, make sure you go into edit mode on the live arc and do a 'save as local story and stop working on the published arc' before you unpublish. I learned the hard way that unpublishing wipes out the file from the server and doesn't save a copy on your local. 
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Unpublishing does NOT save a local copy. If you have a local copy from when you published, and you've made edits to the published copy, the local copy is now out of date.
In other words:
Before you unpublish, go into edit mode of the published version, select save or save as and ensure you have saved a local copy of the published work.
Then unpublish.
"The one thing that can stop a full team of MasterMinds dead in its tracks... a doorway!" --Frogfather
Hi,
Does unpublishing an arc save it locally for editing? I had an arc that was published as well as an old local copy. I unpublished to play around with the Issue 15 settings, but seems like my local copy is still the old one. Maybe I'm just imagining this though...