Indeed, Disaster Recovery is what I was getting at.
While we are explaining terms, a real quick overview to make sure everyone understands SAN. SAN is a Storage Area Network, basically imagine a whole lot (easily up to 45 disks), in a massive RAID array, with a server controlling them. Once thats all set up, you use the SAN administration tools to create LUNS (Logical UNits), which are unformatted "chunks" of disk, which you present to the server(s) of your choice, and then it is up to the admin of that server to mount and format the "chunk" appropriately. In this way, you can buy a big SAN (one off cost), and provide high speed, highly available disk to many servers, while being able to use the same disk on multiple servers (ie, one server uses that piece of disk, but your backup server can also see it, to back it up).
I thought about this some more, and depending on what you need, you could mount the LUNs read-only on say 3 geographically separated servers (once all the data is on there), and then unless you lose the SAN/ network, you are sweet. That may be overkill, but hey. Hope that helps.