Basically to sum it up we have a few older servers running some business critical applications. I say older because they have only one power supply and a very simple RAID 1 configuration. I'm looking into ways to have a backup ready in case it fails.
I'd like to mirror our server onto one of our spare desktops in the case of failure, so we can plug in the desktop in the meantime (obviously slower), while we do a server rebuild. Is there any windows based software that is cheap or effective at mirroring the contents of a server exactly? I would never expect the performance to rival it, but a slow server is better than no server.