I have been forced to move away from my hosting company, as they tried to charge me for services I did not receive and they were not willing to explain. It’s taking a lot of time and work but finally managed to do it with very little down time and without loosing any data.
And the servers now are more powerful and have all the latest software, so I’m running the whole site with just two machines (one of them for the online gaming), and it seems to go quite smoothly.