A family of Microsoft word processing software products for creating web, email, and print documents.
Hiya,
It's not clear from your post one vital aspect of the process - when you finished working on the document each day and hit save (either ctrl-S, via the save button) did you close the document or leave the session open? My guess is that you did the save then put the PC into lock/suspend/hibernate mode.
I'm asking this because all of the issues I've seen seem to relate to several saves over a period of time, then there's a final closing of the document, and at this time the complete session is rolled back to the time the document was first opened. It's happened time and again to us, on user's own PCs and particularly on ours. Users generally run the version of Office 365 for higher education, we run Office Pro Plus 16.04738.1000 64 bit.
Since you did a copy and paste of the final save, in this case it's likely the damage was already done and you copy and pasted the rolled back version.
I've had limited success with recovering updated versions. It appears that every time you hit save a version is written. I know this because we originally thought the issue was USB-related and deep scanned a couple of them and found older versions of the documents (i.e. users said they saved every hour between 12 noon and 5pm and we found deleted copies of the document getting larger with timestamps around 1pm, 2pm, etc.
The problem I'm guessing you were working on you PCs hard disk, not USB, and the chances of recovery using a deleted data recovery tool successfully reduce. There's a good chance that the deleted files may have been overwritten, for example. The only clue I can give you is the files have the correct timestamp and, when on USB, are hidden deletions in the same folder as the original document.
Sorry I can't be of more use than this but, as you can probably guess from the thread above and many others (I've counted around 10 other separate similar threads) it's not even been acknowledged as a problem, never mind resolved.
Good luck!