back up

my host has just informed me that they will have a 1 HOUR DOWNTIME due to maintenance..

now is it possible that I i put the page on another server and create a back up by adding its nameservers to my domain so that when the first host is down, the domain will resolve to the nameservers of the back up host?

how can I make sure my site remains accessible during the downtime of the first host?

thanks..

 

 

 

 

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