I need to do file-level backups of five computers in an office. All of the data will easily fit on a single 1TB disk. I want to use a NAS with three or four removable disks in rotation so I can always have at least one disk away from the office. I can use something like Aeomi or Macrium software to handle the actual backups, so this inquiry is really about the hardware. Is there a NAS solution with removable disks?
You can create the USB to NAS backup ot vice versa. Please refer to the link given below for more information.