A physical device that carries your data for you, instead of sending it over the wires.

AWS Snowball is a service from Amazon Web Services (AWS) that gives you a physical, tamper-resistant device — think of a very tough, briefcase-sized box — that you use to move large amounts of data between your location and the AWS cloud. Instead of uploading files over the internet, you copy your data onto the Snowball device, and then Amazon physically transports it to one of their data centers, where the data is uploaded into your cloud storage over their own super-fast internal network.

Why does this exist? Because internet connections have limits. Even a fast business internet connection can only push a certain amount of data per second. When a company has many terabytes (or even petabytes) of data — think of an entire library of movies, years of scientific research, or every photo ever taken by a hospital’s X-ray machines — sending that over a normal internet line could take weeks or months. Snowball solves this by turning “how fast is your internet” into “how fast can a truck drive.”

Some jobs are simply too big for a garden hose, no matter how long you wait.

To understand why Snowball exists, it helps to do a little bit of simple math. Suppose a company has 100 terabytes of data (a modest amount for a large business — think of hundreds of thousands of high-resolution photos) and a good business internet connection that can upload at 100 megabits per second. Even under perfect, non-stop conditions, transferring 100 terabytes over that connection would take more than 100 days. In the real world, connections slow down, get interrupted, and share bandwidth with other office work, so the real number is often much worse.

There is also a hidden cost: internet transfer is not free, and it is not always reliable. A transfer that takes weeks can be interrupted by a power outage, a network hiccup, or someone accidentally unplugging a cable — forcing you to start over. Shipping a physical device avoids all of that. Once your data is copied onto the Snowball, it does not care if the office Wi-Fi goes down.

From ordering the device to seeing your data appear in the cloud — the full journey.

Even though Snowball feels like a simple “box that carries data,” a lot happens behind the scenes to keep everything safe, tracked, and fast. Here is the internal working, step by step.

flowchart TD
    A[You order a Snowball device from AWS Console] --> B[AWS ships the device to your address]
    B --> C[You connect it to your local network]
    C --> D[You copy data using the Snowball Client or file interface]
    D --> E[Data is encrypted automatically on the device]
    E --> F[You ship the device back to AWS]
    F --> G[AWS data center scans and verifies the device]
    G --> H[Data is decrypted and uploaded into Amazon S3]
    H --> I[AWS performs a secure wipe of the device storage]
        

The Ordering Step

You start in the AWS Management Console, the website where you control all your AWS services. You choose which type of Snowball device you need, how much storage you want, and where it should be shipped. AWS then prepares a physical unit, loads it with a special job identifier, and ships it to you, usually within a few business days.

The Loading Step

Once the device arrives, you plug it into power and into your local network using a standard network cable. The device turns on and shows an E Ink screen (like the screen on an e-reader) with instructions and a shipping label. You then use special tools provided by AWS to copy your files onto the device, much like copying files onto an external hard drive, except this “hard drive” can hold dozens of terabytes.

The Encryption Step

As data is written onto the Snowball, it is automatically scrambled using strong encryption (AWS uses a standard called 256-bit encryption). This means that even if the truck carrying the device were to get lost, nobody could read your files without the secret digital key, which stays safely inside AWS’s systems — not on the device itself.

The Return and Import Step

Once your data is loaded, you print the pre-paid shipping label (it appears right on the device’s screen) and hand it to a shipping carrier. When it arrives at an AWS facility, the device is scanned, checked, and connected to AWS’s internal network, which is far faster than any normal internet connection. The data is decrypted and copied into your chosen storage service, most commonly Amazon S3. Finally, AWS performs a certified secure erase of the device, wiping every trace of your data before the device is reused.

Not all data-moving jobs are the same size — AWS offers different devices for different needs.

AWS does not offer just one box; it offers a whole family of devices, sized for different jobs, from a small backpack-friendly device to an actual 18-wheeler truck.

A closer look at each stage a Snowball job passes through, from request to completion.

Moving data physically might sound risky, but Snowball is built like a digital armored truck.

A natural first question is: “Isn’t it dangerous to mail your company’s data around in a box?” AWS designed Snowball with several layers of protection specifically to answer that worry.

Snowball is not just for storing files — it can actually run programs too.

Here is a surprising fact for beginners: some Snowball devices are not only storage boxes, they are also small, portable versions of the AWS cloud itself. The “Edge” devices can run virtual computers (called EC2 instances) and even short pieces of code (called AWS Lambda functions) directly on the device, without needing an internet connection at all.

This matters for places where connecting to the internet is difficult or impossible — think of a container ship in the middle of the ocean, a remote mining site, or a disaster-response area with no working networks. In these cases, Snowball Edge becomes a temporary, offline version of the cloud that processes data right where it is created.

Like every tool, Snowball is perfect for some jobs and the wrong choice for others.

Choosing between a Snowcone, a Snowball Edge, and a Snowmobile is really a question of scale.

Scalability with Snowball works a little differently than typical cloud scaling. Instead of automatically adding more virtual servers, you scale by ordering more physical devices in parallel. A company migrating multiple petabytes might order dozens of Snowball Edge devices at once, load them simultaneously in different offices, and ship them all back together — turning what would be one impossibly slow internet transfer into many manageable physical shipments happening at the same time.

Snowball shows up in surprising places once you know what to look for.

A few simple habits separate a smooth Snowball migration from a frustrating one.

How experienced teams decide when Snowball is the right — or wrong — tool for the job.

No. Snowball can move data in both directions — into AWS or out of AWS — which is useful when leaving a cloud provider or restoring a large backup to on-site systems.

Because all data on the device is encrypted and the encryption keys are never stored on the device itself, a lost device cannot be read by anyone who finds it. AWS also tracks devices closely during transit.

No special hardware is required. You just need a standard power outlet and a network cable to connect the device to your local network.

The Snowball Edge models can do both — they store files and can also run virtual computers and small programs directly on the device, which is especially useful in locations without internet access.

AWS performs a certified secure data wipe on every returned device, following recognized data-destruction standards, before the device is used for another customer.

While it is most commonly used by large organizations with massive data volumes, any organization with a large enough one-time transfer need — even a mid-sized business — can use Snowball.

AWS Snowball turns the problem of “my internet is too slow for this much data” into a solved problem, by physically shipping a rugged, encrypted device to carry your data instead. From the small, battery-powered Snowcone to the truck-sized Snowmobile, the Snowball family scales to fit jobs ranging from a few terabytes to entire data centers. Along the way, strong encryption, tamper-evident hardware, and certified data wiping keep everything secure, while Snowball Edge devices add the ability to run real computing workloads even without an internet connection. Used at the right scale and planned with enough lead time, Snowball turns what would be a months-long upload into a matter of days.