When it comes to hosting, cloud architecture refers to using an independent server for each and every aspect of the web hosting service. Such a configuration provides improved performance because one machine will be used just for file storage, another just for running databases, etcetera, so different system processes will not run on the same machine. This will lessen the chance of system errors substantially and will allow your websites to run faster, not mentioning the higher uptime. In case you are looking for this kind of service, you have to make certain that you'll really receive it since lots of companies advertise cloud hosting plans, but the control panels they use are not designed to function in a true cloud and can operate only on a single server. The issue with using one machine is that if one service goes down or generates high load, the entire server will most likely go offline, so your websites will no longer be accessible.