Security surveillance systems have moved from the simple camera and VCR model to complete digital video recorder solutions. Sophisticated software and an easy-to-use graphical user interface make real-time monitoring and after-the-fact evidence gathering as simple as using a computer program. With flexible storage solutions and a variety of tools designed for the task, you can quickly build your case by downloading selected files to an evidence file on an external hard drive. By compiling evidence file clips containing the act caught by your security cameras, authorities can quickly view the footage without having to scan through hours of security tapes. In addition, since the clips are preserved on a password-protected external drive, the risk of accidental deletion is eliminated.