You can import this workflow and schedule it to run at regular intervals.
I haven't gone through the work, but you should also be able to modify the workflow to include all the datastores in your environment.
Please read the description in the workflow before you run it.
Just need to make the workflow loop thru a Cluster and get all the datastores. Then add a string filter to disacard the local datastores from the ESX/ESXi servers.
Thanks for this very nice building block to expand on...
Erik