I like NAS as you can use it to serve content to yourself when out and about. For instance I have some music and video on mine, also backups of "important" stuff I may need while travelling. Also it can be seen by my smart TV which is handy. None of that is hard to set up.
Also use it to back up all computers to, and for sharing stuff around the house (again, media, but also other files we may each wnt to dip into from our respective computers)
In terms of power usage, disks and NAS boxes will drop into a power saving mode after x inactivity. so the cost of keeping it on all the time isn't massive. it dos mean that the first access from power saving is a little slower.
It has USB ports but these are for adding USB drives for use on the network, or copying data to/from NAS rather than plugging it in standalone to your PC, so it isn't a portable solution.
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