Thanks for the replies guys, I've been with known host for a while and it's a great service; this post is in no way a reflection on them!
The software I've written is a tournament manager - that's why it's 3 days and mission critical, 600 people in a room relying on it, and if it goes down; bad...
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...