You don’t appear to be able to restore previous versions of worksheets in Excel 365 if you’ve only saved them on your hard drive as opposed to on OneDrive or sharepoint or whatever.
Great, I love it when software updates offer a huge step backwards in functionality unless you share your data with huge corporations, and lead to you unwittingly losing an entire evenings work when you shouldn’t even be working anyway.
Fuck You. You reading this I mean. Not your fault, but Fuck You.