A simple PowerShell script that copies images from the Windows 10 Spotlight cache to the user's Pictures directory. By default, skips images less than 180 kb in size. Works well as a Windows scheduled task

win10-spotlight-thief.ps1

$cacheDir       = "$($env:LOCALAPPDATA)\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets"
$destDir        = "$($env:HOME)\Pictures\Spotlight"
$lastSync       = 0
$sizeThreshold  = 184320

function Read-CacheFiles {
  Get-ChildItem $cacheDir
}

function Read-CopiedFiles {
  $filenames = @()
  Get-ChildItem $destDir | ForEach-Object {
    $filenames += $_.Name -replace '.jpg',''

    if( $_.LastWriteTime -gt $script:lastSync ) {
      $script:lastSync = $_.LastWriteTime
    }
  }

  $filenames
}

function Copy-Images {
  $copiedFilenames = Read-CopiedFiles
  $copyCount = 0

  if( $script:lastSync -gt 0 ) {
    Write-Host "Last Sync      : $($script:lastSync)"
  }

  Write-Host "`r`n"

  Read-CacheFiles | ForEach-Object {
    #Write-Host ( $_ | Format-Table | Out-String )
    if( $_.LastWriteTime -lt $script:lastSync ) {
      Write-Host "Skipping $($_.Name): Old Write Time ($($_.LastWriteTime))"
      Return
    }

    if( $_.Length -lt $sizeThreshold ) {
      Write-Host "Skipping $($_.Name): Too Small ($($_.Length) bytes)"
      Return
    }

    if( $copiedFilenames -contains $_.Name ) {
      Write-Host "Skipping $($_.Name): Already Copied"
      Return
    }

    Write-Host "Copying $($_.Name)"
    Copy-Item "$cacheDir\$($_.Name)" "$destDir\$($_.Name).jpg"
    $copyCount++
  }

  $copyCount
}

try {
  if( ! ( Test-Path -PathType Container $destDir ) ) {
    New-Item -ItemType Directory -Force -Path $destDir | Out-Null
  }

  if( $sizeThreshold -gt 0 ) {
    Write-Host "Size Threshold : $($sizeThreshold / 1024) kb"
  }

  $new = Copy-Images

  if( $new -gt 0 ) {
    Write-Host "`r`n$new new Spotlight images preserved!"
  }
  else {
    Write-Host "`r`nNo new Spotlight images"
  }
}
finally {
  Write-Host "Complete"
}

The script may slow down to some degree if the destination directory is not cleared from time to time.