Upgrade to HD surveillance using this 720P economy HD-over-Coax DVR. Use the same coax infrastructure as your old analog security system while switching out for this 8 camera HD DVR and a HD-over-Coax camera. Not sure it will make that much of a difference? Compare Analog and HD-over-Coax surveillance snapshots here! The economy version is compact and can hold 1 surveillance hard drive with up to 4TB of storage.