Full Administrator rights are required for the account that the vSphere Agent uses to back up and restore VMs.
Note: The following procedure describes how to create a vCenter role using one version of the vSphere Client. For complete information, see the documentation from VMware.
To create a vCenter role for a user:
1. Open a vSphere client and select View > Administration > Roles.
2. If you wish to create a custom user role, you can clone it from the "Administrator" role. Select the Administrator role and clone it.
To back up the entire vCenter, the administrator role should be propagated from the top level.
To back up VMs in a particular datacenter, the administrator role should be propagated from this level.