Answer: Create an S3 Lifecycle configuration to transition objects from S3 Standard to S3 Glacier Deep Archive after 1 month.

## Explanation **Correct Answer: B** - Create an S3 Lifecycle configuration to transition objects from S3 Standard to S3 Glacier Deep Archive after 1 month. ### Analysis of Requirements: 1. **Files accessed frequently for 1 month** → S3 Standard is appropriate for this period 2. **Files not accessed after 1 month** → Need to transition to cheaper storage 3. **Keep files indefinitely** → Need archival storage 4. **Most cost-effective solution** → Need the lowest cost for long-term storage ### Option Analysis: **A. S3 Intelligent-Tiering** - Automatically moves objects between frequent and infrequent access tiers - Good for unpredictable access patterns - NOT the most cost-effective for predictable patterns (1 month frequent, then no access) - Still more expensive than archival options for long-term storage **B. S3 Glacier Deep Archive** - **Lowest cost storage class** in S3 - Designed for long-term archival (7-10 years minimum storage duration) - Perfect for "keep files indefinitely" requirement - Retrieval times: 12 hours (standard) or 48 hours (bulk) - **Most cost-effective** for data that won't be accessed after 1 month **C. S3 Standard-IA** - Infrequent Access tier - Higher cost than Glacier Deep Archive - Minimum storage duration: 30 days - Retrieval fees apply - Not optimal for indefinite storage with no access **D. S3 One Zone-IA** - Similar to Standard-IA but stores data in only one Availability Zone - Lower cost than Standard-IA but higher than Glacier Deep Archive - Higher risk (single AZ failure could cause data loss) - Not suitable for critical backup files that must be kept indefinitely ### Why B is Correct: - **S3 Glacier Deep Archive** offers the **lowest storage costs** ($0.00099 per GB-month vs $0.0125 per GB-month for Standard-IA) - Perfect match for the requirement: "files are not accessed after 1 month" - Designed specifically for long-term archival and compliance - Lifecycle policies automate the transition after 30 days - Meets "keep files indefinitely" requirement at minimal cost ### Key AWS Concepts: - **S3 Lifecycle policies** automate transitions between storage classes - **Glacier Deep Archive** is the most cost-effective for data archived for 7+ years - **Minimum storage durations** and **retrieval fees** are important cost considerations - For predictable access patterns (like 1 month frequent, then never), manual lifecycle configuration is more cost-effective than Intelligent-Tiering

Author: LeetQuiz Editorial Team