We’re experimenting with a “trash bin” for your wiki pages (and soon, characters & items). This safety net will allow you to delete something, then bring it back later if you wish.
It’s not perfect, as certain aspects cannot be restored (like tags), so don’t go throwing things away without a little thought. However, you no longer need to fear that one of your players will spend an afternoon maliciously deleting your entire wiki.
The next logical step is to provide versioning history for your pages. That’s definitely on our TODO list, but I’m not sure when we’ll get to it.