That's the thing. It's in the land of promises and shoulds and
  belief and trust. I'm not taking away from the marvelous efforts
  for perfect data storage; such is impossible.

  But it all depends on how important your data is. Know where you
  data is. Know how it's stored Know how to retrieve it. This is
  true if it's art paintings in a museum or business data.

  Big company saying, "Trust Us, We Got You Covered"? Eh. I use
  cloud computing all the time. I have lots of data stored in
  uber-redundent backup systems whose location I only know the
  cities of.

  Yet, I also back up what matters to me to an external hard
  drive. Sometimes I even print out still. [not as much as I used
  to though; I've fallen behind on that]

  Things that are REALLY important to me, I have in different
  formats on different websites that are run by different
  companies.

  Multiple data centers handled by a single company, _still_
  amount to a single backup. A single takeover of a company and a
  single bad decision can lead to a data loss.

  So, I trust them but only up to a point. I don't expect
  long-term storage (in the span of 10-15 years) out of these
  systems.