A differential backup backs up files that have the archive attribute set but does not reset the archive attribute.

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Quizplus · Accepted Answer

A differential backup only backs up files that have the archive attribute set, but it does not reset the archive attribute like a full backup would. This allows for faster backups by only backing up changed files since the last full backup, but also requires a previous full backup to be useful.

A Differential Backup Backs Up Files That Have the Archive