Which of the following backup techniques is the most appropriate for extremely granular data restore points?

The most appropriate technique for extremely granular data restore points is continuous data backup. This method offers real-time or near-real-time data protection by continuously capturing changes made to data as they occur. This enables organizations to restore data to precise moments, minimizing data loss and allowing for efficient recovery from failures or data corruption.

Continuous data backup provides a significant advantage in scenarios where data integrity is critical, as it supports restoring the system to a specific point just before an incident, such as accidental deletion or corruption. This level of granularity is difficult to achieve with traditional backup methods, which may only allow for daily or weekly snapshots.

In contrast, while other methods like virtual tape libraries and disk-based snapshots may offer useful features for data recovery, they typically do not provide the same level of real-time data capture and restore granularity. Disk-to-tape backups generally focus on archiving rather than on immediate restore capabilities. As a result, continuous data backup stands out as the most effective option for scenarios requiring detailed and timely restoration of data.