The Global Alert in Backup and Recovery will only alert for backup jobs configured within, when they are triggered and complete.
For alerting in storage consumption and capacity, you can leverage a variety of tools: OnCommand/DFM, vCenter alerting, VASA, and a variety of 3rd party tools. I'd highly recommend leveraging VASA for alerting if you are running vSphere 5 and have met all of the requirements on the IMT.