Backup Exec’s dynamic inclusion feature protects new virtual machines and folders that are found when a backup job runs. If new virtual machines are added between the time when the backup job is created and when the backup job runs, Backup Exec automatically backs up the new virtual machines. Because the backup job may include new virtual machines, the job may require more storage space and more time to run than you anticipated. The job history shows the number of virtual machines that were backed up.
If you select ESX or vCenter 4, then dynamic inclusion is enabled automatically for all of the nodes below them that have a folder icon. If no virtual machines are located during a backup job, then the job fails.