I've not seen any, I imagine, most products that utilize the vStorage APIs for Data Protection aka glorified marketing term for vSphere API + VDDK API is most likely selling their product such as Veeam Backup & Recovery.
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William Lam
VMware vExpert 2009
VMware ESX/ESXi scripts and resources at:
VMware Code Central - Scripts/Sample code for Developers and Administrators
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