GRT jobs background processing threads

After GRT enabled job that is backung up Sharepoint or Exchange databases, job starts GRT background processing

.

As far as I can see, it is performing background processing in two concurrent threads - it is processing two databases at the same time.

Is it possible to increase number of concurent processing jobs?

In this situation, I have 5 databases, and since job processes only two databases at the time it lasts for a very long time.

I would try to start background processing of all 5 databases at once, since disk performance is not an issue in this case.