I've had some success using HTTrack Website Copier with some Wikidot sites. You won't be able to edit anything, but should be able to navigate your site while offline. From HTTrack's web site:
It allows you to download a World Wide Web site from the Internet to a local directory, building recursively all directories, getting HTML, images, and other files from the server to your computer. HTTrack arranges the original site's relative link-structure. Simply open a page of the "mirrored" website in your browser, and you can browse the site from link to link, as if you were viewing it online.
Be sure to fully test things after making a copy. If your site is private, you may have problems browsing the copy of the site. It's been a while since I've used it and I've always copied public sites, so I'm not sure how it will handle a private site. As I recall, you won't be able to log in to the offline copy.