When running the USB Backup (plug-in) service, a copy speed reading and a progress bar of some sort would be nice to have, so as to be able to approximately determine completion of the job. And when to return to disconnect the external USB drive.
The rsync job log is helpful as it is, telling what is/has been copied and when a job has been completed. Indirectly it is possible to the determine copy speed by displaying the read speed of the source provided nothing else is reading it. But in practice this is not enough.