Amazon S3 Glacier Deep Archive is designed for long-term backup and archival storage and is the most cost-effective option for data that is rarely accessed and where retrieval times of up to 12 hours are acceptable. Amazon S3 Standard is intended for frequently accessed data and would not be cost-efficient for this scenario. S3 Intelligent-Tiering is used for data with unknown or changing access patterns and incurs additional monitoring and automation charges. S3 One Zone-IA is also less cost-efficient than S3 Glacier Deep Archive for the given scenario because it's designed for infrequently accessed yet still relatively quickly retrievable data, but with a lower cost than the S3 Standard-IA.