I have been adding data to a file opened June 1st. Then after restarting the computer, the file appears with last year's data. How come my files got i

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I have been adding data to a file opened June 1st. Then just this afternoon, around past 4 o'clock, I after restartes the computer,But I can't retrieve the file, loss of integrity: the file appears with last year's data. Can't trace this morning's data. How come my files got intertwined, mixed up? NB: app set to be saved automatically via OneDrive

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