BE Simple Core Pack: Includes all features and options of Backup Exec, plus 5 Instances which can be used for any physical, virtual or 10 M365 users instance (base requirement per site). The BE Simple license calculations assume that all M365 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 M365 users.