Security cameras are great for overlooking areas that need constant surveillance. There is one issue with standard cameras though, they are constantly recording.
While a 24/7 recorded feed is great for the fact that you can be sure everything the camera sees is kept. It can be an issue when sifting through footage to find the specific time the camera actually saw something you should be aware of.
A solution to this is to use movement activated cameras. As the name suggests, these cameras will only start recording when it picks up movement within its visual range.
Another great advantage to movement activated cameras is that they are usually independent units. So they do not need to be connected to a computer or a power supply. Simply put the camera in a spot you consider a prime place for intruders, and come back to the camera after you suspect it may have picked something up.