Automate backup of selected VMs from a VMGroup using RESTAPI

I tried PowerShell module but that is very slow and is not flexible. It gets the job done but the objects it returns lack the values that I need so I have to run multiple GET commands to prepare the command that I need to trigger the backup. For instance:

If I need to run the backup for VirtualMachine1 hosted on Hyperviser1.

• I have to first use Get-CVVirtualMachine which takes 36 seconds to return the object. 
• I then have to get the psudoclient name from the returned object and run Get-CVClient to get its Name(Not the displayName). Takes 3 seconds to return the object. 
• At this point I have all the info that I need to trigger the backup with Backup-CVVirtualMachine.

It takes nearly 45 seconds to trigger a VM backup. I tried running this from inside the Commserv server. 

Thanks for the response. The reason I have to run Get-CVVirtualMachine is that Backup-CVVirtualMachine requires to add the ClientName in the command parameters. Here is the script:

function triggerCVBackups {
    param (
        $Servers
    )
    $JObs = @()
    foreach ($server in $servers) {
        $JOb = $null
        $Vm = Get-CVVirtualMachine -Name $server
        $pseudoClient = (get-cvclient -id $Vm.pseudoClient.clientId).get_Item("clientName")
        $backupJob = Backup-CVVirtualMachine -Name $vm.client.clientName -ClientName $pseudoClient
        $Job = [PSCustomObject]@{
                VMName = $VM.Name
                JobId = $backupJob.jobIds
        }    
        $Jobs += $Job
    }    
    return $JObs
}

Thank you. That will improve the performance. And to your point about the performance of PowerShell and API calls, I did a quick comparison:
 

Both the command return the same number of results but PowerShell commands take more time. 

Hi,

I am calling the same script through Workflow but its failing with error message: 

Below is the script:

$string = {xpath:{/workflow/inputs/VM/clientName}}
$string = $string -replace('\[','')
$string = $string -replace('\]','')
$string = $string -replace(' ','')
#$input=$input -replace('[','')
$Servers =$string.Split(",")
$plainText = "”
$secureString = ConvertTo-SecureString $plainText -AsPlainText -Force
cd 'D:\CVPowershellSDK-master'
$Jobs = @()
Connect-CVServer -Server test -User abc -Password $secureString
$joboutput= $(foreach ($i in $Servers)
{
$JOb = $null
        $Vm = Get-CVVirtualMachine -Name $($i)
        $pseudoClient = (get-cvclient -id $Vm.pseudoClient.clientId).get_Item("clientName")
        $backupJob = Backup-CVVirtualMachine -Name $Vm.client.clientName -ClientName $pseudoClient
        $Job = [PSCustomObject]@{
                VMName = $Vm.Name
                JobId = $backupJob.jobIds
        }    
        $Jobs += $Job
    })
    echo $joboutput

Error Message:

server1
server2
INFO: Get-CVVirtualMachine: virtual machine not found having name [server1]
INFO: Get-CVClient: client not found having id [0]
You cannot call a method on a null-valued expression.

Similary for server2