the answer is a 4TB NAS, two bays of 2TB each, in a RAID1 array.
this serves a dual purpose: the NAS is my “cloud drive”, and the RAID1 array is my backup.
i can “backup” the backup, to “the cloud” or to an external 2TB device (like a flash drive) on a regular basis if i want, at that point, for extra security.
the answer costs around $800, for them to come in, set it up, get all my devices talking to it, from the antique mac to the bleeding edge kubuntu box, and hand me the keys.
i can afford the answer, without having to get “household funds” involved.
because someone send me almost $1,200 for one of my huge boxes of incense, that’s why. 👍
in other news, i paid them $600 and they’re mailing me back the remains of the old NAS, and a disk full of either data, or not-data. 😒 whee.