All Pronto websites are hosted with Rackspace London. All our websites are hosted on the WordPress 3.6.1 platform using the Multisite features.
To build and ensure we have a highly available WordPress Multisite environment, we work closely with our our hosting partner Rackspace under their Managed Cloud services and also work closely with makers of WordPress at Automattic.
Our infrastructure is designed to quickly scale as needed both with additional servers and is monitored 24x7. Our database and other servers are backed up daily. We have also have very deep and redundant monitoring across our infrastructure to dispatch our team and Rackspace engineers if system behavior is abnormal.