I've just seen a WD iCloud, which is an external hard Drive that's connected to the Router with an Ethernet Cable, so it's part of the Network. 3TB Drive is roughly the same price as an empty 2 Drive NAS.
I've got a 4tb WD MyCloud (had it for a couple of years) & it's excellent. Connects to router via ethernet. You then dl the free WD software which you can install on your laptop/desktop/smartfone and access all your content via those means. You can set up specific areas (Shares) & password protect if required.
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