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This document discusses RMAN backup and recovery configurations for Real Application Clusters (RAC) databases in three scenarios: 1. Using a cluster file system for backups, where each node backs up to a shared storage location. Recovery can be performed from any node with access to the backups. 2. Using local non-clustered file systems for backups, where each node backs up locally but nodes can access each other's backups over NFS. Recovery requires NFS access to read archived logs from all nodes. 3. Performing instance recovery in RAC, where the surviving instance(s) perform recovery for failed instances using online redo logs to commit pending transactions and roll back uncommitted ones.