>>25563Structurally they should last a long time. Functionally is another story...
I've had my own company 26 years and I have backups of client files since the beginning. Thing is, those early files were on SCSI drives, that required a special OS extension to use. Eventually I backed them up to DVD-Rs when those became a thing and SCSI became obsolete, then a firewire drive, then optical, then USB-A and B, and now USB-C and the Cloud. (Granted, I'm a Mac guy so planned obsolescence is more a part of my life than others, but you get the idea.)
This was all within a couple of decades, and I did it because it's a necessary part of my business. I'm way less compelled to do this for my porn stash, which is why I basically have nothing that's more than 10 or so years old.
Then you have file formats themselves. Still images haven't changed much, still mostly JPEGs, but video is still distributed in many formats that may or may not be functional as operating systems evolve.
I agree with 25524, this stuff is ephemeral even with the best intentions.