How can a block volume backup be restored in OCI?

The ability to restore a block volume backup as a new volume with varying sizes from the backups is an important feature of OCI's backup management. This functionality allows greater flexibility for users, enabling them to restore their data based on current needs rather than being constrained by the original volume's size.

When restoring a backup, users have the option to specify a different size for the new volume, which can be beneficial in scenarios such as scaling applications or optimizing resource usage. This means that if a user needs more capacity, they can restore a backup into a larger volume, or if they need less, they can opt for a smaller one, as long as it meets the minimum size requirements. This adaptability is key in cloud environments where resource management is often dynamic and can change based on workload demands.

In contrast to this approach, other options suggest limitations on how and where backups can be restored, such as only allowing for the same size or region, which does not leverage the flexibility offered by OCI block volume backup features. Therefore, the correct answer reflects the versatility that OCI provides for restoring block volume backups.