Final answer:
An administrator uses a backup rotation scheme that labels the backup tapes in generations. This scheme is commonly known as a grandfather-father-son backup rotation. It ensures multiple copies of backups are kept at different points in time.
Step-by-step explanation:
An administrator uses a backup rotation scheme that labels the backup tapes in generations. This scheme is commonly known as a grandfather-father-son backup rotation. In this scheme, the backup tapes are categorized into three generations: grandfather, father, and son. The grandfather tapes represent the oldest backups, the father tapes are the intermediate backups, and the son tapes are the newest backups. The rotation involves creating regular backups on the son tapes, then moving them up to the father tapes after a certain duration. Finally, the father tapes are moved up to the grandfather tapes to create a rotation cycle. This rotation scheme ensures that multiple copies of backups are kept at different points in time, allowing for efficient retrieval of data if needed.