AWS Solutions Architect Associate Concepts, S3

• Storage
• S3 - Simple Storage Service
• S3 is object bases storage to upload files (0-5TB file size)
• It is unlimited storage
• In S3 files are stored in globally unique buckets 
• It is a storage service so not suitable for any sort of installation e.g Operating System.
• Turn on MFA Delete - Multi-factor Delete used to avoid accidental deletion of files/ object from S3
• S3 Fundamental
• ID, Value, Version, Metadata
• Sub-resources
• Access control list
• Torrent
• Read after write consistency
• Eventual Consistency
• S3 Classes/Tiers
• S3 Standard
• S3 - IA (Infrequent Access) - Charge on the basis of access
• S3 One Zone - IA
• S3 Intelligent Tiering
• S3 Glacier (Retrieval Time: Minutes to Hours)
• S3 Glacier Deep Archive ( Retrieval Time: 12 Hours)
• https://aws.amazon.com/s3/faqs/

• S3 Encryptions
• Encryption in Transit (SSL/TSL)
• Encryption at Rest / Server-Side Encryption
• SSE-S3
• SSE-KMS
• SSR-C
• Client-Side Encryption
• S3 Version
• Stores all version of an object
• Versioning can be suspended not disable after enabling it
• MFA Delete can be an extra protection layer for object deletion
• S3 Life Cycle Management
• S3 Cross-Region Replication
• S3 Transfer Accelerator 
• https://s3-accelerate-speedtest.s3-accelerate.amazonaws.com/en/accelerate-speed-comparsion.html
• Storage Gateway
• File Gateway
• Volume Gateway
• Stored Volumes
• Cached Volumes
• Gateway Virtual Tape Library