The best way to know what happens when you are not at home or in the office is to use webcams to watch and see everything, even though you`re not there. For this you just need a program like I can see you.
I can see you is a security program that, via a webcam, controls what your nanny does with your children, for example. You can also configure it to only activate when it detects movement; if this happens, it will send you an email automatically so you can connect.
In the I can see you configuration options you can take periodic screenshots of what is being recorded.