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I just recently made phpWiki version 1.2.9 (the current stable version) into a XOOPS module. It's been tested under XOOPS 2.0.2. Pages are stored in the XOOPS database, so for dumping and backing up the wiki pages, you could use, for example, the phpMyAdmin XOOPS module. I'm about to contact the XOOPS organizers about contributing this phpwiki module to the XOOPS module repository.
--dbritton