Back-up hosting and DNS

[bcarl314]

I've got a question about nameservers.

If I want to backup a site on a secondary server such that if the 1st server crashes the second will take over, how do I do this?

Let's say that the nameservers for the primary are as follows:

ns1.mynamesever.com
ns2.mynameserver.com

And the nameserver for the backup is:
ns1.mybackup.com

If I modify my DNS settings as follows:
DNS1 = ns1.mynameserver.com
DNS2 = ns2.mynameserver.com
DNS3 = ns1.mybackup.com

If the primary host goes down, will this then use the 3rd nameserver to my backup host?

[MCookie]

No.
Nameservers are not sniffers. They just translate your domain name in an IP number and don't know if your server is down.
The only way to do what you want is to put nameserver1 and main site on the same server and nameserver2 and backup site on a second server at another host.
If you are that worried about the site going down better find a good host.