Which disaster recovery solution is most cost-effective for a financial system with a zero recovery point objective and a 72-hour recovery time objective?

The most cost-effective disaster recovery solution for a financial system with a zero recovery point objective (RPO) and a 72-hour recovery time objective (RTO) is a synchronous remote copy of the data in a warm site that can be operational in 48 hours.

A zero RPO indicates that no data loss is acceptable, which necessitates regular updates to ensure data is replicated in real-time or close to real-time. In this context, a synchronous remote copy effectively meets the requirements of having a data backup that mirrors the primary system without any data loss, as all transactions are applied immediately to the remote site.

The fact that the warm site can be operational in 48 hours aligns well with the 72-hour RTO, ensuring that the business can resume critical functions within the necessary time frame. This balance between cost and effectiveness makes it a judicious choice, considering that warm sites typically involve lower infrastructure and maintenance costs than hot sites while still offering timely recovery capabilities.

By contrast, other options present challenges like higher costs without necessarily providing better alignment with the set objectives, making option B the optimal choice for cost-effectiveness while still adhering to the recovery requirements.