Pass Command to Variable to Test-Path

Question

I'm passing a command to a vCenter in PowerCLI to backup VDS switches using a script I found on the internet. I want to do a test-path for the export location though to see if it backed up successfully. This would be okay if the portgroup name was static
but it pulls it using a $_.name variable piped in from the get-vdswitch command. If I do a test-path for that variable outside of that line then it won't recognise it will it? Here's the code.
foreach ($switch in $switches)
# Backup each vNetwork Distributed Switch not including the port groups
export-vdswitch $switch -Withoutportgroups -Description “Backup of $switch without port groups” -Destination “$full_path\$switch.without_portgroups.$date.zip“
# Backup each vNetwork Distributed Switch including the port groups
export-vdswitch $switch -Description “Backup of $switch with port groups” -Destination “$full_path\$switch.with_portgroups.$date.zip“
# Backup each port group individually
get-vdswitch $switch | Get-VDPortgroup | foreach { export-vdportgroup -vdportgroup $_ -Description “Backup of port group $($_.name)” -destination “$full_path\$($_.name).portgroup.$date.zip“
To clarify, entire code works but I need to test that they backed up. The first two lines (export-vdswitch) will be okay because $full_path, $switch and $date are declared outside of that loop. So the problem comes doing a test-path on the location of the
final command (probably could've said that briefer). Although retrieving the export path in a concise fashion would be beneficial.
Thanks in advance

Answer 1

Ho to clear things up? If I want to have it export to a variable called $exportedfile I can't pipe it out at the end like this for example:
get-vdswitch $switch | Get-VDPortgroup | foreach { export-vdportgroup -vdportgroup $_ -Description “Backup of port group $($_.name)” -destination “$full_path\$($_.name).portgroup.$date.zip“ | $exportedfile
If I try that it tells me that expressions are only allowed as the first element of a pipeline so how would I test-path against the output?