The key concern of data backup and recovery schemes is:

Data aggregation and breach prevention are data governance concerns, not the primary purpose of backup and recovery schemes.

Data backup and recovery schemes are fundamentally designed to ensure data integrity and availability by preventing loss from failures, preventing accidental or malicious overwrites of valid data, and protecting against deliberate or accidental destruction. This encompasses the full scope of threats that backup strategies must address, covering availability and integrity as core data security principles.

Multiple data centers support disaster recovery objectives but are a provider capability, not the core concern of the backup and recovery scheme itself.

Ensuring deleted data is unrecoverable is a data sanitization or data destruction concern, which is separate from backup and recovery.

Data commingling is a multi-tenancy isolation concern, not a concern specific to backup and recovery design.