A datacenter team performs a full backup to LTO-9 tape every night.
Monday-Thursday tapes are overwritten the next week.
Each Friday tape is kept for five weeks before reuse.
The last Friday tape of each month is archived for 12 months, and the December copy is stored permanently off-site. Which tape-media rotation methodology does this schedule implement?
The described schedule creates three successive generations of media:
Daily copies (sons) that are reused the following week.
Weekly copies (fathers) that are retained for several weeks.
Monthly and yearly copies (grandfathers) that are archived long-term. This hierarchy of daily, weekly, monthly, and annual full backups is the hallmark of the Grandfather-Father-Son (GFS) rotation scheme. Tower of Hanoi also reuses tapes but follows a power-of-two interval pattern rather than fixed daily/weekly/monthly sets. First-in/first-out simply overwrites the oldest tape in a fixed pool and lacks long-term archival copies. Reverse incremental is a backup file chaining method, not a tape rotation schedule. Therefore, Grandfather-Father-Son is the only option that matches the scenario.
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