One possible idea would be to do daily backups of WD and the entire WD directory. Save these to an external drive, DVD-RW or Flash drive maybe.
You could then use the FAQ for moving WD from one computer to another in the event your main wx machine took a dive…
http://discourse.weather-watch.com/t/10888
WDL is not licensed to a machine but to a domain and should be unaffected if you move WD to another machine as you would just continue to upload your clientraw files from the new machine to your website.
-Bob