Hello, thanks for reaching out. I'm Ace, one of the Independent Advisors.
The best solution to properly copy your files from OneDrive to your PC without losing them is to first download the files manually. Open OneDrive in File Explorer, select the files and folders you want to keep, and copy them to a local folder such as C:\Users\YourName\Documents. After ensuring all files are safely stored on your PC, disable OneDrive backup and sync by accessing OneDrive settings and stopping the sync for Documents, Pictures, and Desktop. Once this is done, unlink OneDrive from your PC through its settings menu, making sure all files are copied beforehand to prevent accidental deletion. Finally, change the default save location for new files by going to Settings > System > Storage > Change where new content is saved and setting Documents, Pictures, and Videos to save directly to your PC instead of OneDrive.
Let me know if this method works.
Thanks!