Q: How is Acronis Backup 12 licensed? A: Acronis Backup 12 is licensed per protected system, virtualization host, or Office 365 mailbox. For example, if you have three physical servers, two VMware vSphere ESXi hosts, and five Microsoft Azure VMs with a server operating system installed, you will require eight (3+5) server licenses for physical and cloud workloads and two virtual host licenses for the virtual hosts.