Backblaze top out at about 8mbps, has the OP had a different experience?
I get about 40mbit/s at work which is about the max I can get with the upload there. I've found you can greatly improve the speeds if you have an SSD as the cache drive (you can set this in the preferences).
But yes, I'm going to have a hard time maxing this out. When I do need those bursts of 65mbit/s, this will be amazing. (Eg. quickly copying a VM)