如何复制整个目录结构?

我正在将 10,000 个文件从一个目录复制到另一个目录.

I am copying 10,000 files from one directory to another directory.

两个目录结构都有相同的文件；但是，尺寸可能会有所不同.

Both directory structures have the same files; however, the sizes might be different.

如何强制覆盖不同大小的文件，并且不复制相同大小的文件?

How do I force overwriting on files that have different sizes and DO NOT copy files that are the same size?

到目前为止，我有这个:

So far I have this:

$source = 'D:\Test1'
$destination = 'D:\test2'
$exclude = @('*.db','test2.log')
$sourcelist = Get-ChildItem $source -exclude $exclude
foreach ($file in $sourcelist){
  $result = test-path -path "$destination\*" -include $file
  if ($result -like "False"){
    #uncomment the next line to see the value being passed to the $file parameter
    #Write-Host $file
    Copy-Item "$file" -Destination "$destination"
  }
}

我认为这会复制目标上不存在的文件.但是，我也想复制确实存在但大小不同的文件.

I think that will copy files that do not exist on the destination. However, I also want to copy files that DO exist but where their size differs.