We do have a datacenter in the EU (Amsterdam) - and if you set up your account there you'll be able to transfer data to it. That's a popular destination for folks living closely to it, but even before that one went "live" we had lots of people using the our West Coast Data Centers without much issue. If you have a ton of data you can take a look at the Fireball (https://www.backblaze.com/b2/solutions/datatransfer/fireball...) which allows you to rapidly ingest data to us.
What are you using as TCP congestion controller? BBR should provide better utilization on long pipes (e.g. transoceanic transfers if stuff isn't geo-replicated). Totally anecdotal, but it helped me FTPing data from the US to europe.
