There are several license types that can be used by Acronis Backup for VMware:
Acronis Backup for VMware uses “per-socket” licensing scheme, where each CPU socket of an ESX(i) host requires one license of Acronis Backup for VMware. The licenses are assigned to the ESX(i) host upon first backup or replication of a VM from this ESX(i) host. If this host is a part of VMware cluster then the licenses will also be assigned to all other ESX(i) hosts which are included into this cluster.
All serial numbers with their details and statuses are listed according to their license types.
Acronis Backup for VMware uses either Acronis Backup for VMware Standard License, or Acronis Backup for VMware Upgrade License. To add Acronis Backup for VMware Upgrade License there must be sufficient number of Acronis vmProtect 6/7/8 Standard License registered already, or otherwise adding the Acronis Backup for VMware Upgrade License will fail.
The number of available licenses shows how many licenses (Backup for VMware Standard Licenses and Backup for VMware Upgrade License) can still be used to assign to the ESX(i) hosts. Used licenses are the licenses already assigned to their respective ESX(i) hosts. Total number of licenses are used and available licenses combined. The number of not upgraded licences indicate vmProtect 6/7/8 standard licenses for which there are no Acronis Backup for VMware upgrade licenses added.