I've enabled and disabled the EA cloud many times, starting NFS games over from scratch. It doesn't cause any "problems later".
Steps are simple:
1. Go find the save files. Rename the "save" folder.
2. Right click the game on Origin and select "Game Details".
3. Disable cloud saves.
4. Start game. You will get a message saying the local save and cloud save do not match. Choose "I want to use local save". This will overwrite your cloud save. (but remember, you still have your "cloud save" in the renamed folder" so don't worry if you want to go back)
5. Re-enable cloud save the next time you start the game so the saves will be in sync.
If you ever want to go back to the first save, just repeat the steps but set the renamed folder back to the original name. Good luck. I've done it on ever Criterion and NFS game since Hot Pursuit.