An administrator has several years' worth of incremental, differential, and full backups on a variety of legacy media. All the data must be kept for several years due to various regulations. Which…

Legacy media such as older tape formats and optical discs degrades over time and may become unreadable as hardware and software to access them disappears, so migration to modern media addresses long-term readability. Storing both the original and the migrated copies off-site provides geographic redundancy, ensuring a fire, flood, or other localized event cannot destroy all copies. This combination satisfies both the data integrity and regulatory retention requirements described.

Storing both copies on-site eliminates geographic redundancy, meaning a single localized disaster could destroy all backup copies simultaneously and violate retention requirements.

Copying to identical legacy media does not resolve the core problem of media degradation and format obsolescence that threatens long-term readability of aging backup formats.

Keeping only the legacy media off-site while retaining the modern copy on-site leaves the primary readable copy exposed to local physical disasters without off-site protection.