ISC2 CISSP Practice Question

Maintaining at least one onsite copy allows fast, locally accessible restores for routine issues, while keeping an additional copy offsite (for example, in a cloud or remote data center) ensures that a fire, flood, or theft at the main facility cannot destroy every copy of the data. This hybrid approach follows the widely cited 3-2-1 rule: keep three copies of data, on two different media, with at least one copy stored offsite. Solely onsite backups provide speed but share the same physical risks as production data, and solely offsite backups sacrifice restore speed. Relying on RAID mirroring alone is not a backup at all-it offers hardware fault tolerance, not point-in-time recovery.