You may get an error during the upgrade of Veeam Backup & Recovery to version 8, stating that the vPower NFS service is unable to start. Alternatively, when updating the individual components, you may also get a similar error (such as: "Error 1920.Service Veeam vPower NFS Service (VeeamNFSSvc) failed to start. Verify that you have sufficient privileges to start system services.").

There are several reasons possible for this, but the most likely one is a wrong NFS Datastore path specified in the registry, usually because the drive that the datastore is pointing to, is no longer present.
Another reason could be that your server has the "NFS sharing" feature installed,   ...