Just a couple of points to consider. First, with Amazon RRS, the cost per GB/Month drops to $0.10. If you are keeping a local disk based backup as well as a remote cloud based backup (you can get both at the same time), the risk of using RRS over the standard service drops considerably.
Wrt to bandwidth costs, using T1 pricing is a little deceptive as well. For example, in many urban locations you can get Fios lines that are 20mbps down and 50 mbps uplink for less than $100/month. You can move a TB of data a day with a 100mbps link.
Add deduplication to the mix (available with most modern backup apps) and your 10 TB of data just became less than 1 TB (obviously depends on what you are deduping).
So with a combination of cheap bandwidth, effective dedupe, local and remote disk based backup copies, and lower cost Cloud Storage, the TCO analysis tips quickly to Cloud backup solutions.
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