You can back up your important folders on your PC (your Desktop, Documents, and Pictures folders) with OneDrive, so they're protected and available on other devices.
Important: If you're surprised that your files are saving to OneDrive, see Files save to OneDrive by default in Windows 10.
Select the blue cloud icon in the Windows notification area, select More > Settings, then Backup > Manage backup.
Select the folders that you want to backed up.
Select Start backup.
You can back up a maximum of 5 GB of files in OneDrive for free, or up to 1 TB with an Office 365 subscription.