BE Simple Core Pack: Includes all features and options of Backup Exec, plus 5 Instances that can be used for any physical, virtual or 10 Microsoft 365 users instance (base requirement per individual physical site, cloud, or air-gapped environment). The BE Simple license calculations assume that all Microsoft 365 users are protected by 1 site.
BE Simple Add On: Includes 1 Instance (requires BE Simple Core Pack).
An Instance is defined as a simple compute instance (e.g., a virtual machine in a cloud environment or physical host in a data center) or 10 Microsoft 365 users.