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As this article points out, nailing down proper security is only half the battle. The other part of the equation for a safe cloud environment is availability. Cloud collaboration service provider ftopia's usage of Amazon S3 cloud infrastructure, for instance, mirrors data across multiple physical locations - critical for cloud storage, as it backs up the data and ensures that the service is always up and running.
On the security front, extra points go to ftopia for its self-validating data integrity feature powered by Guardtime which enables users to determine whether data has been compromised - something to think about in light of Dropbox's current situation.
Know what you're signing up for before you give up your data. Read networking technology analyst Dave Greenfield's take on reaching a higher level of confidence in cloud computing.