The practice of copying data to a separate medium or location to protect against hardware failure or data loss. A full backup captures all data, while a differential backup captures only data that has changed since the last full backup. Combining both methods reduces backup time and storage usage while still allowing recovery to a recent state. Backup files should be stored on external media separate from the server to avoid both copies being lost in the same failure.

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• 2012h24h #81A 社は業務で使用しているサーバのデータをサーバのハードウェア障害に備えてバックアップをしたいと考えている。次のバックアップ要件を満たす計画のうち，A 社のバッ…