Nonsese - confusing storage with transfer.
Bandwidth restrictions come from the ISP - not Carbonite.
It would take at least a day or two to upload 3-4GB on my slow DSL connection...
Their storage capacity might be unlimted - but you will always be limited as to the amount you can backup daily by your ISPs bandwidth.
No, Carbonite and Mozy actually do throttle the amount of transfer once you exceed what they view is abusive. Basically, they give you infinite or unlimited storage but they make it impossible to reach whatever value they have designated. It doesn’t matter how fast your ISP is, the backup companies put the brakes on.
My friend found Carbonites policy on it and was ticked. He was planning to drop them before the Rush incident.