The best tested NAS have been rated best by independent experts such as Kieskeurig.nl, Hardware.info, or Tweakers.net and have received an award for this. There are awards for the best price-quality ratio and awards for the best product regardless of price. Choose a network attached storage with an award and you're sure to choose a product that appeals to the experts. Stream 4K movies with a NAS with Ultra HD Plex support. Go for a NAS with multiple slots for hard disks or SSDs and set up the disks in RAID setup for automatic backups. This way, you'll longer lose data.