How to Back Up Photos to Amazon S3 (and Why You'd Want To)

Google Drive and Dropbox are the default answer for phone backup, but they're not the only one. If you already use AWS, or you'd rather pay for exactly the storage you use instead of a flat monthly plan, you can back up photos to Amazon S3 just as easily — you just need an app that treats it like a first-class drive instead of a developer-only afterthought. Here's how to set it up with Sync, and what to actually weigh before switching. The same four steps back up any folder to S3, not only photos, from iPhone, iPad, Android, Mac or Windows.

Why S3 for photo backup

S3 isn't trying to be a consumer photo app — it has no built-in gallery, no sharing links, no automatic album sorting. What it offers instead: storage you control down to the bucket and region, pricing tied directly to how much you store and transfer, and independence from any single consumer account. If you're already paying for AWS for other reasons, routing your phone backup there too can mean one bill instead of two. And because it's just object storage, your backup isn't tied to a phone-maker or consumer-cloud ecosystem at all.

The tradeoff is setup: S3 expects you to create a bucket and an access key in the AWS console first. Sync handles everything after that, but the initial AWS-side step is more involved than tapping "sign in with Google."

Step 1: Create a bucket and access key in AWS

In the AWS console, create an S3 bucket (pick a region close to you for faster transfers) and generate an access key with permission to read and write to it. This is standard AWS account setup, not a Sync-specific step — if you already use S3 for anything else, you can reuse an existing bucket or create a dedicated one for backups.

Step 2: Add S3 as a drive in Sync

Open Sync, go to the Drives tab, tap Add Drive, and choose Amazon S3. Enter your access key and bucket details. Sync connects directly to your bucket — your credentials and files stay between your device and AWS.

Step 3: Create a Backup task

Go to the Tasks tab and tap New Task. Choose your photo folder as the source and your S3 bucket as the target. On Android that is DCIM. On iPhone, iPad and Mac, Sync works with folders in the Files app and does not read the Photos library, so save or export the photos you want into a folder in Files and pick that. Pick Backup as the operation — it uploads everything from source to drive and never deletes anything, which is what you want for a safety copy. (Backup Sync is the follow-up operation: it uploads only what changed since the last run, so repeat backups are quick.)

Step 4: Run it

Tap the task and run it. Sync uploads your photos to the bucket and reports what transferred. Save the task once, and re-running it later — after a trip, at the end of the week, whenever — is just a tap. Nothing runs automatically in the background; you decide when a backup happens.

Backing up other folders to S3

Nothing in the setup is specific to photos. Once your bucket is added as a drive, any folder can be a source: documents on a Windows PC, a project folder on a Mac, downloads on an Android phone. Create a Backup task for each folder you want in the bucket, and run it whenever you like. Backup never deletes anything from the bucket, so S3 keeps every file you've copied there until you remove it.

Browse your bucket from your phone

Sync's built-in file manager works on every connected drive, S3 included — browse, upload, download, rename, and delete objects in your bucket from the same screen you use for Google Drive or a USB stick. No separate S3 client needed.

Is it actually cheaper?

For raw storage, often yes — S3's per-GB pricing tends to undercut the effective cost of a bundled Google Drive or Dropbox plan once you're paying for extra storage. But it's not a flat comparison: S3 also bills for requests and data transfer, and a consumer plan bundles in things S3 doesn't have at all (photo viewing, sharing, search). If you're only backing up — not browsing or sharing from the cloud day-to-day — S3's model tends to favor you. Check AWS's current pricing for your region and expected usage before deciding; don't take "usually cheaper" as a guarantee for your specific case.

Already have files in Dropbox that you'd rather keep in S3? The "Moving files from Dropbox to S3" section of our Amazon S3 vs Dropbox comparison covers the two-step route.

What it costs (in Sync)

Amazon S3 is one of the drives available on Sync's free tier — connect any one drive at no cost, ad-supported, and try the workflow above on a small batch of photos. The free tier caps how much a single task can transfer, so backing up a full photo library takes the paid upgrade. Connecting S3 alongside other drives, or unlocking USB/external drive support and the built-in Wi-Fi web server, is part of Sync's paid upgrade — a subscription or a one-time lifetime purchase.

Get Sync

Sync connects to Amazon S3, Google Drive, Dropbox, OneDrive, Box, and local storage — including USB drives — from one app on iPhone and iPad, Android, Mac, and Windows. If you're weighing S3 against your other cloud options generally, our guide to syncing files to Google Drive, Dropbox & more covers the rest of the field.