“In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day.”
We should ask ourselves these questions more often than we do: Is this true, or is this only thought to be true by people in my circles? Do I want it to be true?
“We live in a society absolutely dependent on science and technology and yet have cleverly arranged things so that almost no one understands science and technology. That’s a clear prescription for disaster.”
“What counts is not what sounds plausible, not what we would like to believe, not what one or two witnesses claim, but only what is supported by hard evidence rigorously and skeptically examined. Extraordinary claims require extraordinary evidence.”
Passwords are lost, providers are hacked, and people pass away. Moreover, as Seth mentions, most companies aren't incentivized to make data reliability a priority because data reliability isn't exciting. Besides, human beings aren't very good at making long-term decisions. Very few people are clamoring for safeguards that will help them in ten years.
The lesson? Back up your data! Make extra copies of important files and share them with people you trust. If you have the need and the means, work with a company that truly understands archival. Otherwise, you may find, at the least opportune moment, that no one is doing it for you.