Rather than run directly on your local machine, I would look for a VMWare appliance that is a preconfigured VM & Wiki software that is ready to go. You can then run this via the free VMWare player on a desktop or even a server down the road.
The advantage to this is that backing up the wiki is a simple, self contained operation - you simply shut down the VM and copy the files somewhere. Conversely, restoration is easy too - if you mess it up, simply shut down the virtual machine and copy the files back over from your backup.
Running in a VM is also great if/when the wiki becomes more important - it’s trivially easy to run the VM on server hardware going forward, using either the VMWare Player or a proper ESX deployment.
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-Scott
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