A 4-bay NAS is equipped with 4 slots for internal hard drives or SSDs. With a 4-bay NAS, it's possible to set up a RAID configuration, which allows for secure backup. You also stream Full HD or 4K movies to a television or computer with a NAS that supports plex. Choose a network attached storage with a Quad-Core processor for multiple heavy tasks such as 4K video streaming and backups.