Backups are having trouble connecting to your repository on a windows file server cluster and they are failing.
You want to make sure that you configure vRanger to use \\{clustername}\[sharename} and not \\{cluster node name}\{sharename}. Also if a failover of the file server cluster occurs while a backup is going on this will cause a problem with communication with the repository and the backup job will fail during the failover. As long as the file server cluster is not performing a failover and the clustername is used vRanger backups will be successful.