Yeah, that sounds right to me, but I haven't actually made any extra versions just yet. Cavedude would probably be the best to give the final verification on whether that is all that is needed or not.
One thing that might be worth mentioning is that I think spawning a zone initially will spawn it as version 0. So, you might need to have it copy version 0, or you could just set it to allow you to select which version to create the copy from and which version to save the new copy as. Again, CD would have to verify that to be 100% sure.
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