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Choose the storage service by the interface your application needs. Use S3 for whole objects stored in buckets, EBS for a persistent block volume attached to an EC2 instance, and EFS when several clients need to mount the same file system. Performance, access frequency, durability, and cost then decide which tier, volume family, or EFS configuration fits.
What each service actually provides
Amazon S3: object storage in buckets
S3 stores data as objects inside buckets, and applications read and write them through S3 operations and APIs rather than through a mounted disk or directory tree. AWS lists typical uses as data lakes, static websites, mobile application content, backup and restore, archives, enterprise applications, IoT data, and analytics. Because S3 offers several storage classes built for different access patterns, the phrase “S3 storage” does not by itself describe one price or one latency profile. Pick the class along with the service.
Amazon EBS: block volumes for EC2
EBS provides block-level volumes that attach to EC2 instances and behave much like persistent disks. Volumes are formatted and mounted by the operating system, which makes EBS the usual home for boot volumes, databases, and other transactional workloads that need low-latency random reads and writes. EBS volume families differ in IOPS, throughput, and cost. SSD-backed families suit transactional and latency-sensitive work, while HDD-backed families target large, sequential, throughput-oriented workloads. The instance type and the workload’s own I/O pattern both limit the performance you actually receive, so a provisioned volume rating is not a guarantee on its own.
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EFS is a managed file system accessed over NFS. It supports NFSv4.0 and NFSv4.1, and several AWS compute services can mount the same file system at once, which is the main reason to choose it. Its Regional option stores data across multiple Availability Zones in a Region. The One Zone option keeps data in a single AZ, which lowers exposure to cost but means the file system does not survive the loss of that AZ. AWS’s current EFS overview states that Windows EC2 instances are not supported as EFS clients, so confirm client operating system compatibility before designing around it.
Comparison at a glance
| Decision axis | Amazon S3 | Amazon EBS | Amazon EFS |
|---|---|---|---|
| Storage interface | Objects in buckets, accessed through S3 operations and APIs | Block volumes attached to EC2 instances | Shared file system mounted over NFSv4.0 or NFSv4.1 |
| Typical starting use cases | Web and mobile content, backups, archives, data lakes, analytics | EC2 boot volumes, databases, transactional and development workloads | Shared application files, content repositories, development environments, media stores, home directories |
| Performance decision | Choose the storage class from access frequency and latency needs; some archive tiers require an asynchronous restore before reading | Choose the volume family from the IOPS and latency profile versus the throughput profile, then confirm the instance can deliver it | Choose a performance mode and throughput mode; General Purpose suits latency-sensitive work, and Elastic throughput scales with activity |
| Sharing model | Many clients can read and write objects, limited by identity, bucket, and network policy | A volume attaches to one EC2 instance; Multi-Attach is available only for specific supported volume types and compatible configurations | One file system shared by multiple compute clients at the same time |
| Resilience choice | Storage class and replication settings change availability and resilience; the classes are not equivalent | Durability differs by volume family; important data still needs snapshots or another backup design | Regional spans multiple AZs; One Zone uses a single AZ and is not resilient to loss of that AZ |
How to choose: a decision sequence
Work through these questions in order. The first one that clearly matches your workload usually settles the service, and the later questions refine the configuration.
- Does the application need a shared directory tree and standard file operations across several clients? If yes, EFS is the candidate. Verify that every client operating system is supported, since Windows EC2 instances are not supported according to AWS’s current EFS overview.
- Does an EC2 instance need a persistent disk for a boot volume or a database? If yes, use EBS. Pick the volume family from the workload’s IOPS and latency needs versus its throughput needs, and check that the instance type can sustain the chosen volume’s performance.
- Is the data naturally addressed as whole objects, read by web or analytics clients, backed up, or archived? If yes, use S3. Then select the storage class by how often the data is read, how quickly it must be retrieved, and how long it must be kept.
- Does the workload combine more than one of these patterns? A single architecture often uses several services, each serving a different data path. AWS recommends purpose-built storage for each data path rather than forcing one service to handle all of them.
S3 storage classes: the cost terms that change the answer
Storage capacity is only one part of the bill. Access frequency, retrieval and request charges, provisioned performance, and the resilience configuration can each change the total. Two infrequent-access classes illustrate the point. According to AWS’s S3 storage class guidance reviewed in October 2026, S3 Standard-IA and S3 One Zone-IA carry a 30-day minimum storage duration and a 128 KB minimum billable object size, and Standard-IA also charges retrieval fees. Objects that are deleted or moved before 30 days, or small objects, can cost more than their per-GB rate suggests. Calculate the full monthly cost with current pricing for your Region and your real read, write, and retrieval volumes; a simple per-GB comparison of the three services is not enough.
Durability, availability, and the numbers you can quote
Durability and availability are separate measures, and published figures apply only to the specific service configuration they describe. The figures below come from AWS documentation reviewed in October 2026.
- Amazon S3: AWS’s Well-Architected Framework cites a design durability of 99.999999999% (11 nines). This is a design target for S3, not a promise that an application can skip backups or recovery planning.
- Amazon EBS: AWS’s volume type documentation lists designed durability of 99.8% to 99.9% for gp3 volumes and 99.999% for gp2 volumes. Quote the figure for the volume family you actually use, and check the live documentation at the time you publish.
- Amazon EFS Regional Standard: AWS’s EFS feature documentation lists 99.999999999% durability design and 99.99% availability for Regional Standard file systems. These numbers do not carry over to One Zone or other EFS configurations without checking the current table.
Do not present any of these durability percentages as an uptime SLA or as a per-object guarantee. When you report them, name the service, the class or volume family, and whether the figure covers a Regional or One Zone deployment.
Security defaults and recovery features
S3 buckets and objects are private by default. AWS recommends keeping Block Public Access turned on unless a specific use case requires public access. Versioning, Object Lock, lifecycle rules, and replication address recovery, retention, cost management, and data distribution, but none of them is active without deliberate configuration. Plan these settings during design rather than after a data-loss or exposure event.
When a combined design makes sense
A typical web application might keep its uploaded media in S3, run its database on an EBS volume attached to an EC2 instance, and place shared configuration or content directories on EFS so several instances see the same files. Each service handles the data path it fits best. Adding a second service only makes sense when the data really follows a different access pattern; otherwise the extra mounts, policies, and backup routines add operational work without a clear benefit.
Rank #4
Sources and dates
- AWS Well-Architected Framework, Data management (2025 version), reviewed October 2026.
- AWS, What is Amazon S3?, and the S3 storage class guidance, reviewed October 2026.
- AWS, Amazon EBS volume types, reviewed October 2026.
- AWS, What is Amazon EFS?, and Features of Amazon EFS, reviewed October 2026.
AWS’s framework states the selection principle directly: the optimal data management solution varies with the data type (block, file, or object), access patterns (random or sequential), required throughput, frequency of access (online, offline, or archival), frequency of update (WORM or dynamic), and availability and durability constraints.
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