Efficient File Backup Script in PowerShell

$sourceDir = "C:\Path\To\Source"
$backupDir = "D:\Path\To\Backup"

if (-not (Test-Path $backupDir)) {
    New-Item -ItemType Directory -Path $backupDir
}

$filesToBackup = Get-ChildItem -Path $sourceDir -File

foreach ($file in $filesToBackup) {
    try {
        Copy-Item -Path $file.FullName -Destination $backupDir -ErrorAction Stop
        Write-Host "Successfully backed up $($file.Name)"
    } catch {
        Write-Host "Failed to backup $($file.Name): $_"
    }
}

$backupCount = $filesToBackup.Count
Write-Host "$backupCount files have been backed up to $backupDir."