Vddk Api Open Failed Exception: Operation 'Open' with connection = '953034712016' path = '[DataStore] vmname/disk0.vmdk' openFlags = 'VIXDISKLIB_FLAG_NONE' failed with VddkApiException: You do not have access rights to this file
This is known to be caused by 2 situations:
The first cause that relates to transports. The RR core defaults to look and see if you have the ability to perform a 'hotadd' or 'Lan-Free SAN' backup with each and every agent-less backup or virtual export. If you do not have licensing for either of these, or there is an environmental component that is preventing this from happening (DNS, IPs) then the job will either fail over to doing an 'NBD' (LAN) transport, or fail saying 'You do not have access rights to this file'
The second relates to VMware itself, which is more often the case, and deals with versioning and/or virtual center resources. To validate you aren't affected by this due to your VMware environment: