VMware block-level incremental backups expire when the previous full backup expires
NetBackup VMware block-level incremental backups of a virtual machine are dependent on the previous full backup of the same VM made by the same policy. When a full VMware backup expires, any later block-level incremental backups for the VM that are based on the full backup also expire and are deleted. The expiration occurs without regard to the retention period in the incremental schedule. This issue applies to all versions of NetBackup for VMware.
Note:
This issue does not apply to NetBackup Accelerator backups.