OneDrive is a cloud-based storage service where you can view, browse, upload, and share the files you saved online to OneDrive.com. When you save files to OneDrive, the files are automatically available to access or share from any device, even if something happens to your PC.
Microsoft is introducing changes to how OneDrive syncs your files. In Windows 8.1, Microsoft used placeholders on your PC to represent files you have stored in OneDrive. People had to learn the difference between what files were “available online” (placeholders) versus what was “available offline” and physically on your PC. Microsoft heard a lot of feedback around this behavior. For example, people would expect that any files they see in File Explorer would be available offline by default. Then they would hop onto a flight (or go someplace without connectivity) and try to access a file they thought was on their PC and it wasn’t available because it was just a placeholder. It didn’t feel like sync was as reliable as it needed to be. For Windows 10, having OneDrive provide fast and reliable sync of your files is important. OneDrive will now use selective sync. This means you choose what you want synced to your PC from your online OneDrive and it will be. What you see is really there and you don’t need to worry about downloading it. You can choose to have all of your online OneDrive files synced to your PC, or just the ones you select, and what you want to keep safe on your online OneDrive cloud.