Not only can you see them from home, but you can watch them from anywhere you have an internet connection. We offer systems that not only have Windows and Mac applications but also have both IOS apps and android apps for your phone or tablet that will not only allow you to see your cameras in real time, but also view video clips from a specific time and date that are stored on your NVR. The length of storage on your NVR will depend on the amount of hard drive space you purchase with your system. Anywhere from 2 weeks to 90 days is possible.