Each type of backup media has associated disadvantages. Which of the following backup media has the highest risk of original data loss and backup data loss?

A.
CD and DVD.

B.
Local hard disk.

C.
Remote hard disk.

D.
Magnetic tape

Explanation:
Using the local hard disk as the backup media means that the risk of original data loss and backup data loss is increased over the other backup media options.
Incorrect
Answers:
A: The disadvantage of using CDs and DVDs as a backup media is its tendency to be slow. In addition to this, the storage capabilities of CDs and DVDs become limited for larger enterprises, especially when full backups need to be performed.
C: The disadvantage of using remote hard drives as a backup media is the limitation placed on the quantity of data that can be backed up. In addition to this, costs associated with performing backups tend to increase over time when multiple remote hard drives are used.
D: Using magnetic tape as a backup media has a number of advantages over the other previously mentioned media. For instance, magnetic tape is a removable media and it can store vast quantities of data – over 600 gigabytes of data.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 378-379.