Not really. Just probability.
If you have fully redundant services then ALL of them have to go down to have an outage.
Suppose you 5 copies with 75% uptime each.
The probability that all of them are down is 0.25^5 ~ 0.0009
Now of course that assumes they are uncorrelated, but since Sia nodes are distributed across the internet, that's likely as opposed to multiple servers at a few data centers like AWS.
They all run the same software stack though, so despite being deployed on diverse hardware, so they can’t claim to only have independent failure modes.
