A cool new feature from the MVP Summit: I previously mentioned how Show Changes debuted 9 months ago. Somewhere in the last nine months, the obscure Version History feature (found under File, Info) has gotten much better.
Save your document to OneDrive or SharePoint Online.
Work as normal in Desktop Excel.
If something gets screwed up, you can go to Excel Online. Use File, Info, Version History and preview every change made from the new Version History panel.
These new improvements will make this an amazing feature.