I think it depends on your network connection. We used a snowball a couple of times to either move data from S3 to or it. In some cases its because we didn't

I think it depends on your network connection. We used a snowball a couple of times to either move data from S3 to or it. In some cases its because we didn't have enough local storage to shuffle the data, or because we only had a 100 meg net link and a couple of TBs to move.