Run multiple tasks with one click

ATI 2015

My system has one physical drive that is partitioned into C: and D:

I have two backup tasks, one to do an incremental backup on C:, and one on D: - tasks are called CDRIVE and DDRIVE.

I've split it this way on purpose because I do not always want to backup both partitions at the same time because of how I store information on them.

If I want to run the CDRIVE task, I can just select and click on the BACK UP NOW tile. Same for DDRIVE.

My question is this. If I want to run both tasks sequentially, how do I do it? I've tried to do a multiple selection on both task names, but that doesn't work. I don't see any options to do this. It would be helpful to be able to select and run multiple tasks as (in my case) I wouldn't have to wait for each task to complete and then select the next task to run.