The vCenter server and all ESX Servers should be at vSphere 6.0, 5.x, 4.1 or 4.0 update 2 if possible. Should update 2 on 4.0 not be available, then a common user must be created on the vCenter server and all ESX Servers to avoid vmx file download issues.
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VMware ESX Server Level - ESX(i) servers must be at version 4 or above.
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Disk Types - Independent disks and Physical RDMs are not supported. Virtual RDMs are supported.
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Stand Alone ESXi - Stand-alone ESXi is not supported without the standard license level. License levels are explained in more detail in the following article. http://blogs.vmware.com/esxi/2009/06/esxi-vs-esx-a-comparison-of-features.html
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Fault tolerant virtual machines that meet the following requirements are supported for backup:
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Configured as fault tolerant in the vSphere Web client
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Hosted on ESX 6.x or later
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VM hardware version 11 or later
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