I'm being a bit hyperbolic, but Ceres is a ball of ice so large it's rounded by its own gravity [0]. I'm pretty sure you could engineer a shelter by using the waste heat of the nuclear reactor to bore a tunnel into the ice.
I wish I knew the math to calculate how much energy would be needed to send data to Ceres and back, because I think the transmission energy might be large enough that it would prevent the cold-storage use case. Reading and writing from flash storage probably requires less energy. That means this Ceres data center would be best suited towards low data, high computation, latency is irrelevant computation. Maybe brute forcing encryption keys or advanced fluid dynamics modeling.
[0] Ceres is 50% water by volume.
