All files in one group of folders (jpeg, gif, doc, ppt and pdf) do not open.

I have a lot of files that I use as teaching material (gifs, jpegs, pdfs, web archives, Word files, PowerPoint presentations) that are in a number of different folders and which I store on an external drive, then copy every year to my hard drive when I teach that subject. I update these files and folders, then copy back to the external hard drive when I have finished teaching. These were all fine last year, but when I try to open any of the files, they all have problems. The image files in Photoshop have the error 'unknown or invalid JPEG marker', in Preview the error is 'it may be damaged or use a file format that Preview doesn't recognise', the PDFs return 'not a supported file type or the file has been damaged', the Word files as to be converted when opened and return nonsense, and the Powerpoint presentations return 'PowerPoint found a problem with content in the file' and after attempting to repair returns 'the file may be damaged'. Any idea what is going on here and how I can fix this? There are 1400 items, which have taken years to compile for my teaching. I have tried opening the files on my external hard drive and on my backup disc, but the same happens.
I've never posted on a forum before, so I hope this is the right place to ask! Any help is most welcome!

The backup files are more recent than when I used them a year ago - I have tried them and I still get the same problem.

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All files in one group of folders (jpeg, gif, doc, ppt and pdf) do not open.

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