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I’m confused

Too Many Differentials?

You imply that one should save differential backups in sequence, but that seems to contradict the whole point of a differential backup. For example, if I follow a 3-week schedule of a normal backup followed by a differential backup, e.g., normal backup in week 1 (Sunday), followed by a daily differential backup, a normal backup in week 2 (Sunday), followed by a daily differential backup, and a normal backup in week 3 (Sunday), followed by a daily differential backup. Then beginning the 3-week cycle again. If I create a differential backup on Monday1, shouldn't I replace it with the differential backup on Tuesday1, etc.? I don't need more than one differential backup at a time, do I? or am I missing something?
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