What makes you think digital content won't be preserved in quantity/quality comparable to printed/handwritten content of earlier times? Perhaps private message

What makes you think digital content won't be preserved in quantity/quality comparable to printed/handwritten content of earlier times? Perhaps private messages and emails are less likely to be preserved after the account-holder is deceased, but pretty much everything you do publicly on Facebook is preserved and accessible to others after your death in a memorialized account. It's not hard to believe that our descendants will be able to casually search through our daily musings and pictures of our dinners and whatnot, either on Facebook if it still exists, or an archived version of it captured before the site is taken down/replaced. I also wouldn't rule out more private writings finding their way along in some form or another. People are often sentimental and keep things that belonged to their loved ones. I recall reading a story not long ago of a man who kept his father's video game save files, with the suggestion that he may try passing them on to his children.