What do you do when the server absolutely, positively CANNOT go down.



Hey all,
I have a site I've recently made, and it's going to get used for 3 days.
The problem is, the server cannot go down during those 3 days, I literally cannot lose a minute's worth of data.

Knownhost have been great for uptime, but that doesn't make me any less nervous.

Is there any software solution to stop me turning grey with worry?