Which of the following statements is true regarding data backup?

Comprehensive and Detailed In-Depth Explanation:

The tape rotation schedule is a method used to manage and organize backup media to ensure data is retained for the required period and can be restored when necessary. Different rotation schemes, such as Grandfather-Father-Son (GFS), determine how long each backup tape is kept before being overwritten, directly affecting data retention policies. While real-time backups (option A) provide continuous data protection, they are not always necessary or practical for all systems. Storing backups onsite (option B) offers quick access but may not protect against site-specific disasters; offsite storage is often recommended. Regular restoration tests (contrary to option D) are essential to ensure backup integrity and reliability, not just in failure scenarios.