A systems administrator backs up company data to the public cloud as part of a disaster recovery plan. Which of the following BEST describes this replication method?

Disk-to-disk replication refers to copying data directly between two physical disk devices or storage arrays, typically within the same location, not across geographically separate environments.

Server-to-client describes a distribution model where a server pushes data to end-user client devices, which does not describe a backup or disaster recovery replication pattern.

Site-to-site replication describes the process of copying data between two separate sites - in this case the company's on-premises location and a public cloud provider's data center. This is the standard model for cloud-based disaster recovery, ensuring data survives a local site failure. The term 'site' applies to both physical locations and logical cloud regions.

Peer-to-peer replication involves two nodes of equal standing exchanging data directly with each other, which does not accurately describe the asymmetric relationship between an on-premises system and a cloud backup target.