PBWiki/wikispaces export features?

I've used PBwiki in the past, but now seem to be more of a wikispaces aficionado. However, as some of you may know, it's not that easy transferring wiki pages you've already created to another wiki. Does anyone have any insights into/suggestions about this?

I have a faculty member who has created pages on PBwiki, but would rather use wikispaces. Is there an easy way to export all pages, or do they need to be copies individually? Thanks in advance for any help.