I double checked the configuration. I've resetted the configuration, deleted the job and reconfigured it again, to no avail.
In individual sites, the job didn't even start.
In multisite installations it takes forever to complete. But it stalls on mysql dump.
I used to love this free plugin so I want to find a solution to these issues. Maybe, due to the great rewrite you have done with it. I hate the new UI, it's takes so many clicks to perform an action. The previous UI was just great :(