You should always be looking for a managed service from your hosting provider. For us here at Nimbus Hosting, our managed hosting means that we are responsible for the Operating System (CentOS, Ubuntu and Windows) and the control panel or Hosting Platform being used on the server (STORM, Plesk or cPanel).
The client is responsible for the application, for example WordPress and the subsequent plugins being used in WordPress and the hosting partner is responsible for looking after the server. This will be subject to the hosting provider’s Service Level Agreement you choose to partner with.
We only provide Server Managed Hosting to our customers. For you, this means that we have full responsibility for the hardware, keeping it straightforward for you and leaving the physical server and all its working components to us.