OT: Home backup strategy - NAS, DAS, Time Machine

[weaponsgrade]

My 2-bay WD MyCloud NAS device crapped out on me. I'm working on trying to recover what I had and will probably make another post for help, but for now I wanted to check if my new backup strategy for network attached storage and direct attached storage will work.

I've got 4 Mac computers that need to be backed up. My plan is to get a NAS (looking at the Asustor Drivestore 4 AS1104T) to serve as a backup target for the 4 Macs. I then plan on backing up the NAS to an external hard drive. Asustor says one of the backup options is to an external hard drive.

But, does that mean I can simply take that external hard drive, hook it up to any computer, and see my files?