AWS Certified Cloud Practitioner / Amazon S3

S3 Storage Classes Overview

📦 Amazon S3 Storage Classes

Every object you upload to S3 gets a Storage Class, which decides how it's stored, how fast you can access it, and what it costs. Different classes suit different needs — frequent access, occasional access, or long-term archiving.

📁 The 7 Storage Classes

  • 📂 S3 Standard (General Purpose)

  • 📁 Standard-Infrequent Access (Standard-IA)

  • 🏢 One Zone-Infrequent Access (One Zone-IA)

  • ⚡ Glacier Instant Retrieval

  • 🧊 Glacier Flexible Retrieval

  • ❄️ Glacier Deep Archive

  • 🤖 Intelligent-Tiering

💡 Exam tip: Know what each class is for — not necessarily every number.

Whenever you upload an object to Amazon S3, you can:

  • ✅ Choose its storage class during upload.

  • ✅ Change its storage class later if needed.

  • ✅ Use Amazon S3 Lifecycle Rules to automatically move objects between storage classes over time.

For example:

  • A newly uploaded photo can start in S3 Standard.

  • After 30 days, it can automatically move to Standard-IA.

  • After one year, it can automatically move to Glacier Deep Archive.

This automation helps reduce storage costs without requiring manual work.

🛡️ Durability vs Availability

💎 Durability

The odds your data survives long-term. All S3 classes offer 99.999999999% (11 nines) — lose roughly 1 object out of 10 million every 10,000 years.

✅ Important: Every Amazon S3 storage class provides this same high durability.

🌍 Availability

How often you can access your data on demand. This does vary by class (e.g., S3 Standard = 99.99%, meaning ~53 minutes of possible downtime/year — data isn't lost, just briefly unreachable).

⚠️ Note: Your data is not lost—it simply cannot be accessed for a short period.

📊 Comparing Storage Classes

Although each storage class has different costs and retrieval times, they all share one important feature:

✅ Every Amazon S3 storage class provides the same 99.999999999% (11 nines) durability.

The main differences are:

  • 📍 Availability

  • 💰 Storage cost

  • ⏳ Retrieval speed

  • 📅 Minimum storage duration

  • 🎯 Intended use case

You don't need to memorize every number for the exam, but you should understand the purpose of each storage class.

💰 Storage Pricing

AWS prices each storage class differently, based on how it's meant to be used:

  • 📂 S3 Standard — the priciest tier, since it's built for instant, frequent access

  • 📁 Standard-IA — cheaper to store, but you pay a retrieval fee each time you access data

  • 🧊 Glacier classes — much cheaper overall, in exchange for longer wait times on retrieval

  • 🤖 Intelligent-Tiering — automatically balances cost and performance for you

This is an example for us-east-1

⚠️ Again, don't worry about memorizing exact numbers for the exam — just understand why each class exists and when to reach for it.