Hear about the Sidekick catastrophe?

What began last week as a service disruption for T-Mobile Sidekick users devolved into one of the worst calamities in mobile/cloud synchronization thus far. One week after announcing the prolonged disruption, T-Mobile, its Sidekick service provider Danger, and Danger parent company Microsoft alerted users that the disruption had become a complete failure, resulting in the loss of contacts, calendar entries, to-do lists, and photos which users had synced to the network.

This is why I would never rely on a cloud-based system without a rock solid backup feature.

Link:
http://www.betanews.com/article/...