Backing up and restoring wiki server

Yes. All the wiki databases are located here:

/Library/Collaboration

You could tar up this folder like:
cd /Library
sudo tar -czvf wiki_backup.tar.gz Collaboration


then, when you need to restore it:
cd /Library
sudo rm -fr Collaboration
sudo tar -xzvf wiki_backup.tar.gz


The only thing that annoying is, after you restore the directory, the wiki formatting is all messed up. To resolve this, you need to reboot the server. Unless anyone else knows how to fix it?

Hope that helps.