VirtualBox is good for beginners to learn about virtualization, but it is not suitable for running your virtual servers 24/7.

If you are on Windows Pro, you can leverage on the built-in Hyper-V hypervisor. Unfortunately this is not available if you only have Windows Home.

If you are willing to move away from Windows, you can try VMWare's ESXi Hypervisor. However, using this method you will lose the ability to use the workstation as a desktop and will have to manage the server from another machine via your network.