Many people install CCTV thinking that it is enough to keep them safe. CCTV is proven to put off a number of burglaries prior to them happening but does not stop break ins altogether.
If you are installing CCTV you need to consider carefully where you are going to have it. Making sure that entrances are covered is a great way of capturing unwanted visitors as they come in, but it may not only be the inside of your house you wish to protect. You may wish to consider installing outdoor CCTV to cover the area where you park your car or side / back or your house.
Remember CCTV can often only be used as evidence if the crime is shown to be committed on the footage. Therefore it is vital to try and cover as many areas and from different angles as possible if you really do want to cover all your bases.