Follow this guide to recover previously saved versions of a file.
1. Locate the file in your local OneDrive folder and right click the file.
2. From the menu select Version History.
3. From the list displayed hover over the version you want to recover and click the three dots to the right.
4. If you want to check the file before you restore you can choose View Online and it will open in your web browser.
5. Click restore if you want to recover that version.
Once the restore is complete the copy shown in your OneDrive folder will be the recovered version.
The other versions will still be available in the version history...