XF 2.0 Importing the same data twice

If I import data from an existing board (VBulletin 3, in particular), and then import the same data again, can I have XF2 replace, or ignore, the duplicates? I've been running imports of a subset of my forum so I can test things out, because a full import would take a long time; I've then made a lot of customisations of the forum setup, which I don't want to lose. So I'd like to do a full import, but this will of course be importing the posts from the subset again, as well as all the other posts, and I don't want two copies of those. So I'd like the XF2 VB3 importer to ignore those posts it already knows about. Is this possible? Or, failing that, is there a way of exporting my current XF2 setup and customisations but without exporting the posts, so that I can then set up a fresh empty XF2 install, import all my customisations, and then import all the posts in one go?
 
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