Recover synchronized Draw.IO diagram

[Community Plus - Home Health Care & Nursing]

While using draw.io in Google Drive I accidentally hit the synchronize button instead of save.  The diagram reverted to owner's prior version from four days ago. There is no save or change history from the prior four days. Is there any way to recover this diagram?

[David Benson _draw_io_]

This forum is specific to Atlassian products, if you're using draw.io only with Google Drive the better place to ask is https://groups.google.com/forum/#!forum/drawio