Right, you definitely shouldn't request all 200GB at the same time, because it'd be expensive and also because you probably can't download all 200GB immediately

Right, you definitely shouldn't request all 200GB at the same time, because it'd be expensive and also because you probably can't download all 200GB immediately either. Arq (a backup app I wrote) takes a transfer rate from you (guesses your max transfer rate as a default) and then requests enough to be downloaded in 4 hours at that rate. 4 hours later, it requests another 4 hours' worth while it downloads the first 4 hours' worth, and so on. This mitigates the peak-transfer fee.