You're probably thinking about their computer backup service. This post talks about B2, an object storage service like S3.
While B2 isn't as fast as S3 and some tasks are way slower (eg: deleting files), I'm able to max out my server's 1Gbps connection when sending or downloading files from their European DC (using rclone and a server also in Europe).
While B2 isn't as fast as S3 and some tasks are way slower (eg: deleting files), I'm able to max out my server's 1Gbps connection when sending or downloading files from their European DC (using rclone and a server also in Europe).