The S380 HomeBase comes with non-removable 16GB local storage. It can store 2 months’ worth of videos for a system with 1 camera, or 1 month for a system with 2 cameras (30 motion detections a day and 60 seconds of recording each time). 

The S380 HomeBase supports adding an external hard drive with a serial ATA (SATA) interface, and its space up to 16TB, which can store years of videos for a system with 1 camera.

You can get more detailed information about the External Hard Drive for the S380 HomeBase in this article: How to expand the Local Storage of the S380 HomeBase (HomeBase 3)?