Quoting Uwe Kleine-König <email@example.com>:
If the concerns are mostly about the hardware not being rackable, there
is a rackable NAS by Netgear:
This seems to be out of stock and discontinued, unfortunately.
Anyway, I'm relatively sure, that I can convince my boss to sponsor/donate
both armel and armhf hardware for Debian, if that is of any help. Or arm64
used in "32 bits mode".