I had a problem with too many backups from our personal data (Photos,videos etc.)
Always I had 1-2 hard drives to backup all important files every time.
Too many duplicates!!

So I created a batch file that for every image-video file type in my backup , will move only one in a new folder, sorted by daytime taken and in a folder of that year, then it renamed all with the datetime of the file.

Now I have a great backup sorted by year in folders since 2003. Just saved me from 2 terabyte duplicates and I have now 600gb sorted backup files!