Instructions to start and/or stop backing up your My Documents, Pictures, & Desktop folders with OneDrive can be found here:

 

https://support.microsoft.com/en-us/office/back-up-your-documents-pictures-and-desktop-folders-with-onedrive-d61a7930-a6fb-4b95-b28a-6552e77c3057

 

Your screens and processes may vary slightly from this document.