It's relatively easy to restore wiki pages here after spam or vandalism. There is an RCS archive containing the necessary page revisions.
The necessary steps:
- please set your username in "Preferences" to make the "Archive"-link at the bottom of the page visible.
- select "Archive", choose the revision you want to revert to, then choose the link "Text".
- copy all the text from the textarea, go back to the page edit form and replace the current page content and "Save".