I haven't digged to deep into this yet, but I'm seeing this behavior on one of our backup servers running v9.0.0.1715. Between 23:30h and 05:30h there seems to be zero throughput while there are enough jobs scheduled starting from 20:00h. There is no network traffic rule defined in the Veeam settings.
Perhaps someone can point me in the right direction to check if this is normal behavior?