by Richard van Iwaarden.
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I think I found it. Why are there 9 tasks running for 17 hours or longer? These should have been killed after 30 minutes, at least that is my setting in Moodle. Check this:

So what happens actually makes sense. The backup process starts but it finds 9 concurrent tasks running. So the rest gets queued. I have no idea how to kill these tasks and why are they holding up everything... to bad I see task ID, process ID... but no course ID.