Oh, you should thank people for their stupidity; "Because you can't keep yourself from clicking on damn near everything, I was able to pay off my car 3 months early. Thanks!"
Not quite the same thing, but you might zero the free space if you plan on taking an image of the drive, or transfering an image to a new host.
I wouldn't even bother zeroing the drive for security purposes; it gets the hammer once pulled from production.
That hasn't been my experience; you select the drive you want to keep backed up and off it goes. It has an exclusion list you can modify ( folders and file extensions ), but otherwise it takes care of business in the background.
Regardless, in the years I've been using it ( on my system and...