The Use the archive attribute option requires your backup software to reset the archive attribute on the files in vault store partitions after they have been secured. If your backup software does not reset the archive attribute, you must use the trigger file mechanism.

When Enterprise Vault creates a file in a vault store partition, the file's archive attribute is set. Until the archive attribute is cleared, Enterprise Vault considers that the file is not backed up, and the corresponding safety copies are not removed. However, when your backup software clears the archive attribute, Enterprise Vault considers that the file is backed up, and is free to remove the safety copy. If appropriate, shortcuts to the archived items are created at the same time the safety copy is removed.