Redundancy? I have a .tar.gz of my university account that's 25 years old at this point and a .ZIP of my old DOS, Turbo Pascal, etc. stuff that's a few years o

Redundancy? I have a .tar.gz of my university account that's 25 years old at this point and a .ZIP of my old DOS, Turbo Pascal, etc. stuff that's a few years older. They've been copied so many times over the years and I'm not even sure the path my current copies took. They lived on floppies, on a CD-R for a long time, different PC hard drives, external backup hard drives, flash thumb drives, Dropbox / Google Drive / iCloud, and most recently a microSD card that lives in my MacBook's port. I'm sure it's been on a couple tapes and Zip disks but those media likely long outlived any installed drives I had. Can't remember ever getting a bit error or corruption on a copy. Even the CD-Rs that were well past their alleged lifespan read fine for me.