We use a Hybrid Cloud Hosting model where we combine our own server architecture with AWS to provide the best performance and uptime.
Our internal Server architecture is housed at Rackspace which allows us to easily support a global application configuration and maintain a very high level of uptime and performance virtually anywhere in the world. We combine this with the ability to use AWS and Azure for all our customers remote file servers.
Combine this with our in-house monitoring system PMAX which provides proactive monitoring and automation to fix most issues before they become issues. And of course our highly trained infrastructure staff whose only job is to keep things running.