If you remove modules with the intention of reusing them elsewhere (rather than temporarily for decorating) it's a good idea to reset them to factory defaults before removing them.
Much has been written on the darkside of the web for job applicants, how employersmayfindyour Facebook profile and read of that drunken student exploit, or of political view they disagree with, or to cross-check your CV for those little *ahem* embellishments.
Not in a metaphysical sense, but why bother with home automation? After all, you can always just walk to a light switch and turn the light on*, can't you?