IngestUse a separate physical drive for Photo Backup. Ingest’s second verified copy is one part of a backup workflow: arrange off-site protection and editor/catalog backups separately.
A Lightroom catalog backup does not back up your original photographs. See 3-2-1 backup guidance for keeping originals safe across media and locations.
Project folders that separate source photographs from outputs are an approach also used by Capture One Sessions. They are not mandatory standards.