> NATS is very upfront in that the only thing that is guaranteed is the cluster being up.

Not so fast.

Their docs makes some pretty bold claims about JetStream....

They talk about JetStream addressing the "fragility" of other streaming technology.

And "This functionality enables a different quality of service for your NATS messages, and enables fault-tolerant and high-availability configurations."

And one of their big selling-points for JetStream is the whole "stora and replay" thing. Which implies the storage bit should be trustworthy, no ?