NBU 7.1 master - Will Image clean up & catalog backup can run at a same time

I don't think you'd want to run them at the same time but NBU 7.1 and Windows 2003 are no longer supported so it doesn't really matter. 

Seems you have 2 questions:

1. Will image clean up & catalog backup run at a same time?

2. Can image clean up & catalog backup run at a same time?

Question 1 may be asking if NBU will automatically run the two at the same time.
My experience has been that NBU automatically runs image cleanup after catalog backup has completed.

Question 2 seems to indicate that you want to run both at the same time.

So - which one is your actual question?