Services like Amazon's S3 and Rackspace's Cloud Files are well worth the $0.15 to $0.30 a month that it takes to keep a backup of most websites. Better yet, ke

Services like Amazon's S3 and Rackspace's Cloud Files are well worth the $0.15 to $0.30 a month that it takes to keep a backup of most websites. Better yet, keep a copy in each service and avoid problems that could occur from either service. If your website is static then you could actually serve directly out of either service in case of an emergency.