[brianwski]

I would recommend 1 GByte chunks for several reasons. The first reason is that you'll get very good throughput and efficiency at that large size. If you go as small as 10 MBytes we see long distances to our datacenter not "ramping up" fully. In other words, we can't get a single threaded application between New Zealand and California to get the advertised bandwidth for small chunks, but up at 1 GByte we DO get the advertised bandwidth. But if you go too large (like 5 GBytes) we have seen that you start seeing too high a percentage of uploads rejected because of bit errors occurring somewhere in the networking between your computer and our servers (the SHA-1 checksum won't match).