Having SFTP as a download protocol is excellent. Often SFTP is used in combination with rsync to avoid downloading files that have already been downloaded. This is a benefit for downloading the latest calibration frames as well as individual images. If users have a method to avoid downloading files, that are already downloaded, this also implies less upstream for the servers.
However, when using rsync there is a requirement to have rsync installed on the server as well. Therefore, I'd like to ask if it would be possible to install rsync on the image download server. Depending on the used host OS, this might just be as easy as apt install rsync.
Thanks,
Christoph
