It’s not that it all started with Amazon, but they were certainly the ones to mainstream cloud-based storage.  Now, there are a variety of services such as Mozy (with CrashPlan) and BackBlaze from some of the smaller, niche  players (both of them support the Mac) to Apple (can you say Mobile Me), Microsoft, Amazon (who now supports Windows Server and SQL Server), Google, Symantec, EMC and others for some of the more major players. According to James Staten of Forrester research, the cloud computing bubble will burst in 2010, if not before.  At that point, we’re likely to start seeing far more feature rich applications start getting released and one would hope even the introduction of integration between backup software and various cloud offerings.