Did you figure it out? If not, I assume from what I read that the author is referring to many systems keeping replicas of data on different members of the cluster. By keeping replicas, you increase the amount of data stored by can survive the failure of any given node.
Microsoft's full product name is "Azure Service Fabric" which properly disambiguates it rather than staking a claim to a common network-related single English word as you claim the Python fabric library does.
