You are asking about getting around download limits. They are experts in getting around download limits.
I'm not suggesting you ask them to see if they have already backed up your data.
I'm suggesting you ask them to help you get around download limits.
limits are usually tied to IP addrs, so you need to launch jobs from many different ip addrs. Which they do. they have the infrastructure and knowledge to help you, and you are a good cause so they may help.