VM Backup only supports paid editions of VMware ESXi; the Freeware Edition of VMware isn't supported. If you're unsure whether you have a paid or the freeware edition you can check via VMware's Management Object Browser.
- You'll need to login to the ESXi host itself via a web browser of your choice in order to access the Management Object Browser (MOB).
- The link you'll need to use is https://enter-your-ip-here/mob/?moid=ha-license-manager&doPath=licenses
- In this screen, you'll now see editionKey, where you'll see either esxiBasic which denotes its the Freeware Edition or else the name of the licensed edition you are currently running:
Freeware ESXi shows esxBasic or esx.hypervisor.cpuPackageCoreLimited
The paid edition of ESXi shows the name of the licensed edition