Since the backup is on an external drive, I guess that I maybe once removed the drive to soon (without safe removal). About the version, I am not sure, but a rather old one, as this happened back in 2014 / 2015. Until recently I did not check my backup...
This makes me think your harddrive is "cluster f*cked".
A file can be corrupt in two ways:
1 - The software (in your case bitcoin core) had a failure when writing the file
2 - Your harddrive failed and corrupted the file
In case 1 you can ask for extern help -> copy the file, hand it over and let somebody try to recover it
In case 2 you can NOT ask for extern help by handing out a copy of the file since you can not hand over the harddrive index and cluster build.
In case 2 (i am 90% sure this is your case) the only thing you can do is hand over the complete harddrive to a specialist who will try to rebuild or restore your harddrive index and clusters with special software.
If i where you i would look for a local company that can rebuild broken harddrives and ask them if they can recover the file, most of those companies do a quick scan and tell if it's possible or not within 1 hour.
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