Mirroring an onsite hosted website
I've just set up an inhouse web server to host our school website on. I was wondering what the best way of redirecting visitors to a different server would be should the internet connection drop?
I either want to be able to direct users to a page on another server explainging that the site is down or have a mirror copy of the site on the other server that is used when our server's unobtainable.
Would I be able to use a php script to check the status of the server and then redirect to another server if necessary?
Any help would be appreciated.