Re: Lost Sims 3 data after attempting to recoved bad file.

@imzadi35  I wrote this guide for Sims 4, but the concepts are the same for Sims 3:

https://answers.ea.com/t5/PC/CURRENT-ISSUE-Sims-4-saves-user-content-disappearing-PC/m-p/12475370

Choose whichever category suits you and follow the instructions.  If you get stuck on a particular step, let me know what you're trying to do and how it's not working.

I personally don't have OneDrive linked at all, but it IS possible to use it selectively while preventing it from syncing your data automatically.