Network-attached storage (NAS) is a file-level computer data storage server connected to a computer network providing data access to a group of clients. NAS systems are networked appliances that contain one or more storage drives, often arranged into logical, redundant storage containers or RAID. A NAS unit is a computer connected to a network that provides only file-based data storage services to other devices on the network. A secure way to storage and share files. YOu can find NAS-sations for home usage, small business and for enterprise.