A Microsoft file hosting and synchronization service.
OneDrive, if you have that enabled will sync your files in the Desktop, Documents and Pictures folders.
1
Log into OneDrive with your Microsoft account https://onedrive.live.com/ then check what files are synced to the cloud, and if necessary, download them to your PC to ensure you have a local copy of your files.
2
Open OneDrive settings from its cloud icon on your Taskbar, then remove the folders that are listed as syncing to the cloud.
3
Restart (not shut down) your PC to apply the change, then in OneDrive settings, un-sync your account from OneDrive and finally, in the Settings App - Installed Apps, uninstall the OneDrive app.