There are two descriptions about backups, the correct ones are: Description 1: The disaster recovery solution does not need to consider whether it is backed up on tape or hard disk. Description 2: The backup plan should consider the worst case.

The choice of backup media, such as tape or hard disk, is a critical component of a disaster recovery (DR) solution. This decision directly influences key metrics like Recovery Time Objective (RTO) and Recovery Point Objective (RPO), as well as overall cost and data retention capabilities. Disk-based backups typically offer faster recovery, while tape is often preferred for long-term, low-cost, off-site archival. Therefore, a DR solution must consider the media type. Conversely, a robust backup and DR plan must be designed by considering the worst-case scenario. This ensures the organization can recover from the most severe potential disruptions, such as a complete data center failure, thereby guaranteeing business continuity.

A. Description 1 is incorrect; the choice of backup media is a crucial element of any DR plan.
B. This option incorrectly states that Description 1 is right and Description 2 is wrong, which is the opposite of the correct assessment.
D. Description 2 is a correct and fundamental principle of disaster recovery and business continuity planning.

1. Huawei HCIA-Storage V5.0 Training Material. In the "Backup and Disaster Recovery Solution" chapter, Section 2, "Backup Solution," details different backup networking modes and media types (e.g., disk, Virtual Tape Library - VTL, physical tape). The material implicitly confirms that media selection is a core design choice affecting performance and use case, making it a necessary consideration for any DR plan.

2. Carnegie Mellon University, Software Engineering Institute. The CERT Resiliency Engineering Framework emphasizes that a key activity in ensuring continuity is to "Identify and analyze potential disruptions," which includes planning for worst-case scenarios to ensure services can be maintained. (See CERT-RMM v1.2, Process Area: Risk Management, Specific Goal 1).

3. University of California, Berkeley, Information Security Office. In its guidance on "Disaster Recovery Planning," it states, "A DR plan should outline how to prepare for a disaster, what to do during a disaster, and what to do after a disaster... It should be based on a worst-case scenario." This confirms that planning for the worst case is a standard and required practice. (See Berkeley Security, "Disaster Recovery Planning" documentation).