Dear @James McCartney,
Thank you for reaching out to the Microsoft Q&A forum. I’m happy to assist you.
If you accidentally saved over a file, here are several recovery options you can try:
Check Version History
- Open the file in Excel.
- Go to File > Info > Version History.

- Review the list of previous versions and select one that was saved before the overwrite.
- Click Restore to recover that version.
Recover Unsaved Workbooks
- Navigate to File > Info > Manage Workbook > Recover Unsaved Workbooks.

- Look for any temporary or unsaved files stored in your cloud location.
- Select the file and click Open, then save it to a secure location.
Use Previous Versions (if File History is enabled)
Right-click the file in File Explorer.
- Select Properties > Previous Versions.
Check if there is an earlier version available. Click Restore to revert to that version.
I hope this information is helpful. Since I do not have access to your device environment, there may be cases where my recommended solutions do not fully resolve the issue or other problems appear. If that happens, please update me right away with any new details or results in the Comment. I will do my best to support you and help find a solution as quickly as possible.
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