DVS config backup

Hello Fellows,

I am banging my head against a wall here with trying to figure out how to export DVS config using vSphere API from VCO. Calling dVSManagerExportEntity_Task method results in nothing, I suspect my selectionSet may not be correct and this is why task is not being executed. Below is my JavaScript which I am working with at the moment, any ideas what I might be doing wrong with selectionSets or

dVSManagerExportEntity_Task in general?

var dvsManager = sdkConnection.dvSwitchManager;

var dvsConfigTarget = dvsManager.queryDvsConfigTarget(host, dvs);

var dVPortgroupSelection = new VcDVPortgroupSelection();

dVPortgroupSelection.dvsUuid = dvsConfigTarget.distributedVirtualSwitch[0].switchUuid;

dVPortgroupSelection.portgroupKey = new Array();

var selectionSet = new Array();

selectionSet.push(dVPortgroupSelection);

task = dvsManager.dVSManagerExportEntity_Task(selectionSet);