It would be really useful to have some storage media that can truly last 50 years. It is pretty disappointing that most of the media with useful capacity (dvd r etc) cap out at 20~50 years. I wouldn't trust the most commonly used storage now (usb thumb drives) with important data for even few years unless it was stored in triplicate.
Personally I think the best method of long term data storage is spinning hard drives stored disconnected. I have a collection of them that goes back decades (with important data duplicated on multiple drives) including my first ever hard drive bought in mid 90s. Of my entire collection only one HDD broke down (actually one of newer 1tb usb3 drives bought few years ago - it started clicking few weeks ago).
I can't vouch for the current spinning disc tech, but I distrust current SSD tech(SD cards and nvme included) more so my current data gets backed up to a set of spinning discs frequently.
Personally I think the best method of long term data storage is spinning hard drives stored disconnected. I have a collection of them that goes back decades (with important data duplicated on multiple drives) including my first ever hard drive bought in mid 90s. Of my entire collection only one HDD broke down (actually one of newer 1tb usb3 drives bought few years ago - it started clicking few weeks ago).
I can't vouch for the current spinning disc tech, but I distrust current SSD tech(SD cards and nvme included) more so my current data gets backed up to a set of spinning discs frequently.