Yesterday I transfered the server to another host using KVM for virtualization. The new virtual server provides 2 GB RAM, 2 virtual CPU cores, a 60 GB HDD and 40 GB backup space. That should suffice for a while. I used this opportunity to change the underlying filesystem to btrfs which allows the creation of snapshots without the need to stop database applications. This is especially useful for Minetest and the regular server downtime in the morning is gone.
The new IPv4 server address is: 22.214.171.124