Windows Update Delivery Optimisation and privacy

Windows Update Delivery Optimisation helps you get Windows updates and Store apps more quickly and reliably.

How Delivery Optimisation works

Windows Update Delivery Optimisation works by letting you get Windows updates and Store apps from sources in addition to Microsoft, like other PCs on your local network, or PCs on the Internet that are downloading the same files.

Based on your settings, Delivery Optimisation also sends updates and apps from your PC to other PCs on your local network or PCs on the Internet.

Sharing this data between PCs helps reduce the Internet bandwidth that’s needed to keep more than one device up to date or can make downloads more successful if you have a limited or unreliable Internet connection.

When Windows downloads an update or app using Delivery Optimisation, it will look for other PCs on your local network (or from the Internet) that have already downloaded that update or app. Windows doesn’t download the entire file from one place. Instead, the download is broken down into smaller parts. Windows then gets parts of the update or app from the PCs that have it, and parts from Microsoft. Windows uses the fastest, most reliable download source for each part.

Delivery Optimization creates a local cache, and stores files that it has downloaded in that cache for a short period of time.

How Microsoft helps keep your data safe

Delivery Optimisation can’t be used to download or send personal content. Delivery Optimisation doesn’t access your personal files or folders, and it doesn’t change any files on your PC.

Delivery Optimisation downloads the same updates and apps that you would get through Windows Update and the Store, using the same security measures. To make sure you’re getting authentic updates, Delivery Optimisation gets information securely from Microsoft to check the authenticity of each part of an update or app that it downloads from other PCs. The authenticity of the downloads is checked again before installing it.

How to control Windows Update Delivery Optimisation

To stop downloading updates and apps from or sending to other Windows 10 devices on the Internet:

  1. Select the Start button, then select Settings > Update & security > Windows Update > Advanced options.
  2. Select Delivery Optimization (or Choose how updates are delivered in earlier versions of Windows 10).
  3. Select PCs on my local network.

To stop downloading from or uploading to other PCs on the local network:

  1. Select the Start button, then select Settings > Update & security > Windows Update > Advanced options.
  2. Select Delivery Optimisation.
  3. Turn off Allow downloads from other PCs. You’ll get updates and apps directly from Windows Update and from the Store with Delivery Optimization, however you won’t download from or upload to other PCs.

If you use a metered or capped Internet connection, Delivery Optimisation won’t automatically download or send parts of updates or apps to other PCs on the Internet.

To identify a Wi‑Fi or Ethernet connection as metered or capped:

  1. Select the Start button, then select Settings > Network & Internet > Wi‑Fi > Advanced options.
  2. Select the network you’re using, and then turn on Set as metered connection.

Source: https://privacy.microsoft.com/en-GB/windows-10-windows-update-delivery-optimization