[stoppingdown]

I would not rate the burglar problem too high. Laptops and desktops get them some value - but second hand external drives? Here I would be too concerned about failures than to trust these things any kind of data.

Backdoors might be in the OS of other NAS as well, or worse - if it comes from China, I'd be rather sure there is a backdoor in it. I can imagine a scneario where only one of my machines is connected constantly to the internet, others would be offline (except for updates)

Same for me: I have multiple copies of photos (and other stuff) at home, and if burglars manage in getting all of them, well they'd manage in getting more valued stuff than my photos, and I would be worried for other things.

Backdoors concern me too (even though everything is behind a firewall, based on Linux and that I can finely tune, so I could just block all traffic coming from the NAS). And I share the same concerns about China-made stuff...