Details around faults and recovery can be found in the spec (https://github.com/filecoin-project/specs/). The protocol will accommodate both realistic operational needs for good miners and service providers, while maintaining the security of the protocol and Quality of Service for Clients' data. Having a data storage service offline is not good for Clients, and are not good for the service. At the same time, temporary power failures happen, and the protocol needs to accommodate them to some extent. As we get closer to mainnet, we will set cryptoecon parameters and policies, and we will explain them clearly for everyone.