Remove duplicates using Powershell

This is a quick powershell script for removing duplicates files from a folder.
I used it for removing duplicates from my music library.

It is simply listing all the duplicates files from a directory and copy them to a back up folder.

$musicFolder = "c:\MyFolder"
$backupFolder = "c:\Backup"

echo "Get duplicates"
$dupmusics = ls $musicFolder -recurse | Group-Object Length, LastWriteTime | Where { $_.Count -gt 1 }

if($dupmusics.Length -gt 0)
{
echo "Move duplicates"
$dupmusics = $dupmusics | ForEach-Object { $_.Group[1..$_.Group.Count] } | Move-Item -Destination $backupFolder -Verbose
}
else
{
echo "no duplicates found"
}