Hello,
Thank you for reaching out to the Microsoft Community and I'll be glad to assist you today.
I totally understand your frustration here.
By default, any files and folders you save in the OneDrive backup locations—such as Documents, Pictures, Desktop, Music, and Videos—will automatically sync to OneDrive. These folders appear as colored icons in the left pane of File Explorer and are located in **C:/Users/YourUsername/OneDrive**.
To prevent files from syncing automatically to OneDrive:
- Save your files in a location outside the default OneDrive backup folders.
- Keep in mind that if files are synced and the folders has blue cloud icon, they might only be accessible online due to OneDrive’s “Files On-Demand” feature.
If your files are already synced:
- Download them to your device by selecting the folder, right-clicking, and choosing **Always keep on this device**. (Files that you mark as "Always keep on this device" have the green circle with the white check mark.)
- Once downloaded, move or copy the files from the OneDrive folder to a different location.
- You can then disable backup or uninstall OneDrive entirely.
To disable backup:
- Right-click the OneDrive icon in the taskbar.
- Select **Settings** > **Manage Backup**.
- Turn off the toggle for each folder.

This way, files you save in these locations will always be available offline, without requiring an internet connection.
I hope this information helps. If you have any questions, please let me know and I will be happy to help you further.
Best regards,
Gunasekar N