A company uses a tape-based backup system to perform nightly backups of shared data. The company would like to minimize the backup window and minimize the amount of tapes needed to restore data.

User-defined backups are a custom administrative scope and do not represent a standard backup strategy with inherent properties that minimize backup windows or tape usage.

Differential backups accumulate all changes since the last full backup, growing progressively larger each night, which increases both the backup window and the amount of tape written per session as the week progresses.

Incremental backups capture only data that has changed since the most recent backup - whether that was a full or a prior incremental - resulting in the smallest possible nightly backup job and the shortest backup window of any strategy. Because each session writes only a small delta of changed data, the amount of tape media consumed per nightly backup is minimized compared to differential or full backups. This combination of short backup windows and minimal nightly tape consumption directly addresses both goals stated by the company.

Full backups copy all data every night, requiring the maximum amount of time and tape media per session, which maximizes rather than minimizes both the backup window and nightly tape consumption.