Which replication methodology is best for a scenario with a 24-hour RPO and shared connections for replication and customer access?

The best replication methodology for a scenario with a 24-hour Recovery Point Objective (RPO) and shared connections for both replication and customer access is asynchronous replication. This approach allows for data to be replicated to a secondary site without requiring real-time synchronization.

In this context, asynchronous replication means that data is transmitted to the secondary copy after it is written to the primary site, which aligns well with the 24-hour RPO. It allows for a significant window during which data can be sent without impacting the performance of the primary site. This is especially beneficial when using shared connections, as it minimizes the strain on network resources by not requiring constant and immediate data transmission.

In contrast, synchronous replication would require that data be written to both the primary and secondary sites simultaneously, which can introduce latency and may not be feasible when shared connections are involved. Additionally, regional and multiregional options typically refer to specific geographical distribution of resources and might not directly address the RPO requirements effectively in this scenario. Therefore, asynchronous replication is the most suitable choice given the outlined parameters.