This property returns a value which specifies the total number of
bytes of data allocated for all storage objects. This value may not
exceed the total number of bytes of storage available, which is
returned by the StorageLimit property.
This value does not represent the storage used by a specific
application. This property returns the amount of storage used by all applications that are
registered with the development account, which is identified with the
runtime license key passed to the Initialize
method.