The OneDrive sync app uses Windows Push Notification Services (WNS) to sync files in real time. WNS informs the sync app whenever a change actually happens, eliminating redundant polling and saving on unnecessary computing power.

What happens when you sync OneDrive to your computer?

Using Microsoft OneDrive, you can keep personal files stored on your computer in sync with the cloud. Those same files are then synced automatically and available on other devices. Doing this is an easy way to ensure your desktop and laptop always have access to the same set of documents, photos, and more.

Do files automatically sync to OneDrive?

If you use multiple Windows 10 PCs then OneDrive will automatically keep all these folders in sync, which is particularly useful if you're fond of dropping important documents onto your desktop. ... The process will automatically add your documents, pictures, and desktop folders to OneDrive and keep them synced.