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Firstly, this is not an issue associated with trying to find a file when it has been overwritten. Nor is it one where the file has been accidentally deleted. The gist of the problem is that my document appears to have reverted to an older version, a version from 13 hours before I saved it.
An error message that consistently appeared throughout my write-up (even when it was saving correctly in the few weeks i have been working on this document) was this: error. (i should clarify that I am the only one working on this file so I'm unsure what other updates are conflicting).
Here is a brief overview of events:
30/11/17 15:45 - I saved the document (that was displaying the error, but saved fine anyway) and made a quick copy 'just in case'. Past this point, no saving seemed to take place.
30/11/17 21:00 - the document is reopened and consistently worked on until
1/12/17 04:00 - 7 hours later, the document is saved and closed.
1/12/17 17:00 - the document is opened, but appearing to have been reset to 15:45 30/11/17, when the copy was made.
There is no trace of another version nor automatic backup or any previous versions to go to at all, even though Word tells me auto save is on (all the different possible locations have been checked).
I have searched my whole PC for .asd files, but to no joy.
I was connected to Onedrive the whole time and assumed it was being saved in the cloud, but upon checking it appears the online version has also reverted to the old version.
I've also performed a full scan with Recuva on the off chance the more recent version of the document had been accidentally deleted, but no word files were returned.
As far as I can tell, this is a unique and very frustrating issue with Word. I'm really not sure what to do, having lost 7 hours of work with no explaination or even a shred of evidence that I did any work that night is extremely disheartening. I would like to think the file has just been saved somewhere stupid, but it appears to just be the same file gone back in time.
My version is Word Microsoft Office 365 ProPlus Version 1710 Build 8625.2127
Welcome to SuperUser, thank you for your quality answer, our site remains exemplary by the contributions of members like you ! – 123456789123456789123456789 – 2017-12-04T23:10:44.360
Thanks J, as far as I know there are no programs other than Recuva that could be opening the files, so I'm afraid there's no real lead here. I've redone the work since, putting the issue down to a one time glitch with how OneDrive works :/ – major – 2017-12-06T15:07:39.000
Sorry to hear that Major. That sucks.
I would recommend the 'save as' if you get that error again - hopefully that'll work if it happens again. – J. Gwinner – 2017-12-07T16:48:09.547