When it comes to business security, organisations these days are not obliged to incur the costs of manning a given site around the clock. The pressure is taken off by the installation of high quality commercial security systems that can actually do a fantastic job of monitoring the grounds andrecording everything that goes on out of hours.
Manning the premises overnight does not always have the desired effect. People are fallible after all and there is always the chance that sophisticated groups or individuals will be able to stage break-ins despite the presence of a member of staff.
Electronic systems often do a better job because they take care of all aspects of deterrence and monitoring. Alarm systems put burglars and trespassers off while CCTV cameras keep tabs on all activity in the area. If something happens, it does not go unnoticed and the relevant authorities can be contacted quickly if necessary.
Access control systems also do a good job of making sure that authorised individuals can get in even when unauthorised individuals are kept out. Bringing all of these features together is ultimately a cost-effective way of maintaining secure grounds.