One of the most common media rotation schemes is the grandfather-father-son rotation. In this rotation scheme there are three or more backup cycles. An example of this would be daily, weekly, and monthly. These type of method for backing up media on a computer is one of the most thorough methods. A FIFO system is used with this method.
FIFO means first in first out. Daily backups go through a FIFO sytem as do weekly backups on a weekly basis and monthly backups on a monthly basis. Often some of the backups will be removed from the site and stored for safekeeping.