Again, if you are using a hosting provider, the chances that you will have to restore your wiki due to a natural disaster are slim. However, if your wiki is defaced or vandalized, you may be on your own when it comes to restoring files and content.
While MediaWiki has many countermeasures in place that allow you to undo vandalism, there may be a time where damage is too severe, or too widespread, and it would be easier to just restore the content from a backup you know is void of any damage.
For those of us who are creating a wiki for personal reasons, or for a hobby, a well-developed backup schedule can save a great deal of heartache. However, if you are developing a wiki for your company or business, it is imperative that not only you keep best practices in mind when it comes to backing up your wiki, but also test the restore process. Nothing is worse than a false sense of security from thinking that your backup is working fine. Unless you test it out by restoring...