They key is to diversify. Use different types of storage media, and duplicate your efforts and bury then duplicates somewhere else.

If you can choose only 1 I would choose tape archives. Vacuum seal all your media, whatever they may be. Throw in some of those dehumidifier packets. Moisture will be your biggest enemy.

If possible, also add the means to be able to read your media after a long time. Add a couple of raspberry pi computers, vacuum sealed and dehumidified-by-packets again, and usb readers or HATs for the media you chose (though I doubt you will find a cheap tape drive with USB connection, the only option I found was £9000).

Over the years, as new technology gets developed, in particularly interface connectors that will replace USB, I would add converters if possible or just keep them around. Nothing suspicious about having some USB/sata/sas to <new technology> converter in your house.