Updated metadata I didn't want to update

Many of my 20k images in my main Lightroom folder had an icon which indicated that there was a metadata conflict between disk and Lightroom.  I selected all the images and chose to update metadata in Lightroom's favor.  When I noticed that the files were being updated with all of the combined metadata from every file I stopped the task.  I have a backup from about 4 days before (unfortunately I had moved and deduplicated a number of files in between the last backup and this incident, although less than the number of files which are affected by this mistake).  I am wondering the best way to undo this mistake?

Many of my 20k images in my main Lightroom folder had an icon which indicated that there was a metadata conflict between disk and Lightroom.  I selected all the images and chose to update metadata in Lightroom's favor.  When I noticed that the files were being updated with all of the combined metadata from every file I stopped the task.  I have a backup from about 4 days before (unfortunately I had moved and deduplicated a number of files in between the last backup and this incident, although less than the number of files which are affected by this mistake).  I am wondering the best way to undo this mistake?

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