HDD wall mount bracket for AB manual backup system

I have a hot swap port on my computer a devised a system where I have would two HDD's, A and B, where in one month, i would plug A in and back up, then the next month i would plug in B.

I devised this to store them in a way where i would know which one to grab from backup to backup. one you push one in, it'll pop the one to be used next out a bit, indicating it is to be used.


Yes, I know there are better ways to go about backing up. I simply wanted a way to back up that would be safe f