NetWorker: v9.0 Unable to clone VMware Jobs to CloudBoost Device

Cloning VMware backups (vProxy backup) save sets to a CloudBoost device fails.

mm/dd/yyyy hh:mm:ss meridiem Following savesets will be skipped please make sure saveset id is valid and target pool is valid
<SSID>
mm/dd/yyyy hh:mm:ss meridiem failed to get mmd reservation with err: There are no savesets to clone, mmd reservation is skipped. .
mm/dd/yyyy hh:mm:ss meridiem Unable to update '<SSID(53>/' status. Error: Work item <SSID(53)>/ not found in running list.
mm/dd/yyyy hh:mm:ss meridiem Unable to set work item status for all failed save sets
mm/dd/yyyy hh:mm:ss meridiem No valid input savesets - check CLONE SKIPPED SAVESETS!
mm/dd/yyyy hh:mm:ss meridiem No valid backend job
mm/dd/yyyy hh:mm:ss meridiem   [ORIGINAL REQUESTED SAVESETS]
mm/dd/yyyy hh:mm:ss meridiem <SSID(53)>/;
mm/dd/yyyy hh:mm:ss meridiem   [CLONE SKIPPED SAVESETS]
mm/dd/yyyy hh:mm:ss meridiem <SSID>, <SSID>/<CLONE_ID>;
mm/dd/yyyy hh:mm:ss meridiem Action clone 'clone' with job id <JOB_ID_number> is exiting with status 'failed', exit code 1
mm/dd/yyyy hh:mm:ss meridiem NSRCLONE failed for one or more savesets.

Review of the daemon log at the time <mm/dd/yyyy hh:mm:ss meridiem> of the failure finds the message:

71193 mm/dd/yyyy hh:mm:ss meridiem  0 0 0 708478784 29038 0 <NetWorker_Server_name> nsrd NSR info Protection Policy Notice: Starting action '<Action_name>' for workflow '<Policy_name>/<Workflow_name>'
165718 mm/dd/yyyy hh:mm:ss meridiem  5 5 0 109037312 29038 0 <NetWorker_Server_name> nsrd NSR critical Unable to clone save set with ID '<SSID>': The '<Pool_name>' pool includes incompatible storage nodes: Ensure that you upgrade the following storage nodes to version 9.1 or later: <CloudBoost_Storage_Node_name>.
71193 mm/dd/yyyy hh:mm:ss meridiem  0 0 0 708478784 29038 0 <NetWorker_Server_name> nsrd NSR info Error Alert: Clone operation failed with error: 'NSRCLONE failed for one or more savesets. '.
38758 mm/dd/yyyy hh:mm:ss meridiem  0 0 0 708478784 29038 0 <NetWorker_Server_name> nsrd NSR info policy notice: action clone failed
38758 mm/dd/yyyy hh:mm:ss meridiem  0 0 0 708478784 29038 0 <NetWorker_Server_name> nsrd NSR info policy notice: workflow <Workflow_name> failed
89017 mm/dd/yyyy hh:mm:ss meridiem  1 5 0 708478784 29038 0 <NetWorker_Server_name> nsrd NSR notice Scheduled resource list: NSR Protection Policy <Policy_name> exited with return code 1.