Much of today's recorded history will eventually be lost simply because so many of its documents are electronic. The devices and codes that create and decipher them change so often in the interest of big business that they become useless within decades or less. Not to mention centuries. The effects of this are already apparent in my own home. I'm still saving some old-fashioned floppy disks that used to feed data into my TRS-80 computer back in the 1980s even though I'll never be able to read them again.
from Deep Future: The Next 100,000 Years of Life on Earth by Curt Stager
* Assuming there are any remaining.