When online backup solutions such as box.net, idrive, and dropbox came on the scene, I was skeptical. Store my data on some service provider’s system? Only with caution.
When news of the dropbox scandal was made public, I was not surprised. The promise, “only a customer has access to their own data”, evaporated. Not that it was ever a promise that could ever be kept.
Recommendation: if you insist on storing your data on someone else’s system, encrypt it locally and store the encrypted data on the other system. That is the only way to truly guarantee that no one else can see your data.