Special:Export : Exports the source of individual wiki pages, optionally with their histories, in a thin XML wrapper which includes metadata like time, etc (Help:Exporting pages)
Special:Import : Import pages exported from another wiki in an XML file
Restore deleted pages
Special:Undelete : One way to undelete a page or review deleted revisions of pages
What links here
Special:WhatLinksHere : Finds all pages that link to an article. Three filters are available to except links, redirects or transclusions from the results. It is not yet possible to except transcluded links.