Why doesn't oracle back up the archives that have been backed up?

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When an Oracle database backs up archive logs, the archive log files of the last few days are usually saved and not deleted.

For example:

backup archivelog all;

delete noprompt archivelog all completed before 'sysdate-14'; Keep archive logs locally for 14 days.

When backed up again, the archive is backed up again and again.

Add a clause not backed up 1 times to avoid backing up archived logs.

The order reads as follows:

backup archivelog all not backed up 1 times; do not backup the archive that was last backed up

backup archivelog all not backed up 2 times; archive backup twice the third time is not backed up

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