Global cloud computing traffic is expected to grow 12-fold from 130 exabytes to reach a total of 1.6 zettabytes annually by 2015 — a 66% compound annual growth rate — according to Cisco's Global Cloud Index. 1.6 zettabytes is approximately equivalent to 22 trillion hours of streaming music; 5 trillion hours of business Web conferencing with a webcam; 1.6 trillion hours of online high-definition (HD) video streaming.
From the report: "The vast majority of the data center traffic is not caused by end users but by the data centers and clouds themselves undertaking activities that are largely non-transparent to end users — like backup and replication. By 2015, 76 percent of data center traffic will remain within the data center itself as workloads migrate between various virtual machines and background tasks take place, 17 percent of the total traffic leaves the data center to be delivered to the end user, while an additional 7 percent of total traffic is generated between data centers through activities such as cloud-bursting, data replication and updates."
Cisco Global Cloud Index (2010 - 2015) Infographic
Cisco YouTube Animation: How Big Will Cloud Computing be in 2015?
More on Cisco's Cloud Index can be found here.
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