Network-attached storage (NAS) is the most suitable technology for Tom's requirements. NAS systems are designed to provide centralized data storage, allowing multiple clients or computers to access the same storage space. This centralization simplifies data management, protection, and backup. NAS systems typically include features that support efficient data backup and recovery, such as automatic backup to other devices and fault tolerance through RAID configurations. Unlike direct-attached storage (DAS), which is limited to one user at a time, NAS allows multiple users to access the storage simultaneously, making it ideal for a multinational organization with dispersed teams. NAS also offers remote data availability, which is beneficial for Tom's organization that spans across different regions.