After failing to download any large files from HubiC using either the desktop or the web client, I
decided to try clients using the REST API. The most mature one seems to be
rclone, but even that
(which supports retries) couldn't retrieve a given file after trying for more than 3 hours!
This is the last hours worth of logs from running
rclone copy -vv Hubic:HubiC-DeskBackup_Pictures/Lightroom/Main.lrcat .
Elapsed time: 2h41m1s Transferring: * Main.lrcat: 40% done, 321.944 kBytes/s, ETA: 14m20s