Error 2531 while trying to connect to NFS repository. The error states that you do not have permission to the repository because you cannot authenticate
The NFS storage device (NetApp) has an access list and the Service Console IP range has to be add with Read/Write permission. Looking at the Logs tab for failed jobs it looks like COS mode backups are failing.
vRanger has access so you can create the Repository but the Service Console of the ESX Host does not which cause the backup job to fail.