How to check your OneDrive backup

On the bottom right, select the up arrow to go to your system tray, and select the blue cloud for OneDrive.

Once in OneDrive, click the gear icon for Settings, then Settings once more.

Go to Sync and Backup, then select the button for Manage Backup

In there, ensure all folders (Documents, Pictures, Desktop) are checked.

If all folders are checked, then your data is being backed up!