You are responsible for designing an Apache Beam processing pipeline that reads data from a Google Cloud Pub/Sub topic. The Pub/Sub topic has a message retention duration of one day. The pipeline writes the processed data to a Cloud Storage bucket. Your objective is to choose a bucket location and a processing strategy that can ensure data is not lost in the event of a regional outage, meeting a Recovery Point Objective (RPO) of 15 minutes. What actions should you take?