reside on computers over the network. which is as a result of deficiency of redundancy out of the box. (Some one-bay NAS drives will allow you to attach a 2nd NAS machine or an external harddrive, to that conclude.) https://phoebewrzk388421.jts-blog.com/28533740/the-definitive-guide-to-storage-nas-dubai-storage-nas-network-attached-storage-buy-qnap-synology-nas-storage-devices