Two friends and I would like to build a PC as a server in my house. The idea would be to have a headless server with 3 VMs. I was wondering what would be the best thing to do so that everyone could have their own private space, while optimizing disk space as much as possible (1TB M.2 SSD + 8TB HDD via RAID1). Each of us could play with Docker to have services on top. What software would you use to set up VMs and manage disks, and what advice would you give us in general?

The other option would be to go cloud, with Hertnez + Mega (autoscaling).