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$sourceDirectory='D:\SMBSHARE\LONGPATH'
$destinationDirectory='\\FILESERVER\LONGPATH'
 
function copyFolderWithLongNames($sourceDirectory,$destinationDirectory){
    $sourceParent=split-path $sourceDirectory -parent
    $sourceChild=split-path $sourceDirectory -leaf
    $destinationParent=split-path $destinationDirectory -parent
    $destinationChild=split-path $destinationDirectory -leaf
    $maxFolderLength=248
    if($sourceParent.length -le $maxFolderLength -and $destinationParent.length -le $maxFolderLength){
        $sourceJunction='C:\Source'
        $destinationJunction='C:\Destination'
        cmd /c mklink /J $sourceJunction $sourceParent # Local volumes are required as Source Directory
        cmd /c mklink /D $destinationJunction $destinationParent
        cmd /c robocopy "$sourceJunction\$sourceChild" "$destinationJunction\$destinationChild" /copyall /E /R:0 /Z /NP
        [io.directory]::Delete($sourceJunction)
        [io.directory]::Delete($destinationJunction)
    }
    # Other methods that could also work
    #robocopy "\\?$sourceDirectory" "\\?$destinationDirectory"
    # OR
    #Subst X: $sourceDirectory
    #Subst Y: $destinationDirectory
    #robocopy X:\ Y:\ /copyall /E /R:0 /Z /NP
    #subst X: /d
    #subst Y: /d
}
 
copyFolderWithLongNames $sourceDirectory $destinationDirectory
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