“Cloud storage” covers three different things that get confused all the time: apps that sync your files across devices, services that store raw data for software to read and write, and backup. Choosing well starts with knowing which one you actually need. This guide gives you a way to decide, with current facts from each provider’s own pages.
Updated October 2026: I rewrote this 2022 post. The original was a generic list of five names with similar descriptions, and several statements were wrong or out of date: it described Google Drive and Dropbox as “pay-as-you-go” (they are fixed-size subscription plans), called Microsoft’s suite “Office 365” (now Microsoft 365), and treated Amazon S3 as just another drive. This version separates the three kinds of storage, adds the questions that matter for security and cost, and avoids long price tables that go stale; where I quote a figure, it is from the provider’s page in October 2026 and you should confirm it.
First, Which Kind of Storage Do You Need?
| File sync and sharing | Object storage | Backup | |
|---|---|---|---|
| Examples | Google Drive, Dropbox, OneDrive, iCloud | Amazon S3, Cloudflare R2, Backblaze B2 | Backup tools writing to any of these, or dedicated backup services |
| Built for | People opening, editing and sharing files on many devices | Applications storing and serving data through an API (images, logs, datasets, app uploads) | Recovering from loss: deletion, hardware failure, ransomware |
| Pricing | Fixed monthly plans by capacity | Pay for what you store, requests, and sometimes data transfer out | Per capacity or per device, or storage fees |
| Interface | Desktop and mobile apps, web, sharing links | API, SDKs, command line, S3-compatible tools | Backup client with schedules and retention |
If you are a person or small team who wants files available everywhere, you want sync and sharing. If you are building an application, you want object storage. And in both cases you also need backup, because sync is not backup: when a synced file is deleted, corrupted or encrypted by ransomware on one device, the change usually propagates everywhere. Version history and a trash folder help, but they have time limits.
Choosing File Sync and Sharing
The big consumer services are fairly interchangeable on core features, so choose on where you already live and on privacy needs:
- Google (Drive, Docs, Gmail, Photos) shares one pool of storage. Per Google One, every Google account includes up to 15 GB, counted across Drive, Gmail and Photos, with paid plans adding more. Best if your team already works in Google Docs and Sheets.
- Microsoft OneDrive comes bundled with Microsoft 365 subscriptions and integrates tightly with Word, Excel and Teams. Best for Microsoft-centred organisations. I could not re-check OneDrive’s current plan pages for this update, so verify its limits and prices directly.
- Dropbox is a dedicated file-sync product. Its plans page shows a free Basic plan with 2 GB, individual paid plans from $1.99 a month (50 GB) and $9.99 a month (2 TB) on monthly billing, and team plans priced per user. Best if you want a neutral sync tool that works across Google and Microsoft ecosystems.
- Apple iCloud+ offers 5 GB free and paid tiers from 50 GB at $0.99 a month in the US, up to 12 TB, per Apple’s plan page, and fits an Apple-only household best.
Quotas, plan names and prices differ by country and change, so treat figures as examples and look at your own region’s pages.
Security and privacy questions to ask
- Who can read your files? Most mainstream services encrypt data in transit and at rest but hold the keys, which lets them provide web previews, search and recovery, and means they can be compelled to hand data over. True end-to-end encryption means only your devices hold the keys. Apple offers it as an optional setting called Advanced Data Protection covering most iCloud data (not Mail, Contacts or Calendar); if you lose access, Apple can’t recover that data for you, so you must set up a recovery contact or key. Dropbox lists end-to-end encryption as a feature of its Advanced team plan. If zero-knowledge storage is a requirement, shortlist services that offer it by design and read their documentation.
- Account protection. Whatever you pick, turn on two-factor authentication (an authenticator app or passkey, not SMS where possible), because the account is the key to every file.
- Sharing controls. Check whether you can expire links, require sign-in and disable downloads. “Anyone with the link” sharing is how many leaks happen.
- Where the data lives and what regulations apply (GDPR, HIPAA, local rules). Business plans usually offer data-processing agreements and admin audit logs that personal plans lack.
- Exit. Can you export everything in standard formats if you leave?
Choosing Object Storage for Applications
Object storage stores files (“objects”) in buckets and serves them through an API. It is how most applications keep user uploads, images, logs and datasets. The decision is mainly about cost structure, because there are three meters: storage, requests, and data transfer out.
- Amazon S3 is the default with the deepest ecosystem. S3 pricing lists S3 Standard at $0.023 per GB-month for the first 50 TB in US East (N. Virginia), request charges (for example $0.005 per 1,000 PUT, COPY and POST requests), and data transfer out to the internet at about $0.09 per GB after a monthly free allowance. It also offers cheaper storage classes (Intelligent-Tiering, Standard-IA and the Glacier tiers) for data you rarely read, plus versioning and Object Lock for protection against deletion and ransomware.
- Cloudflare R2 is S3-compatible and, per its pricing page, charges $0.015 per GB-month for standard storage with free egress to the internet, plus per-request fees and a small free tier. It is attractive when you serve a lot of downloads.
- Backblaze B2 is a low-cost S3-compatible option. Its pricing page lists storage from $6.95 per TB per month, free egress up to three times your stored data each month and free API calls for most operations. It is popular for backups and archives.
The hidden cost to model is egress. A product that serves large files to many users can spend more on data transfer than on storage at S3’s rates, which is why providers with free or low egress exist. Estimate your real numbers (GB stored, requests per month, GB served) and put them through each provider’s calculator. Also check how easy it is to move: S3-compatible APIs reduce lock-in, but egress fees can make leaving expensive.
If you are on AWS, note that the free tier changed: AWS now offers new accounts up to $200 in credits rather than the old fixed free allowances, and the free plan ends after 6 months. See our AWS EC2 cost notes for how that plays out in practice.
Backup: The Part People Skip
- Follow 3-2-1: three copies of your data, on two different kinds of storage, with one copy off-site (in a different provider or account).
- Separate the backup from the thing it protects. If one account compromise or one accidental delete can erase both the data and the backup, you don’t have a backup. Use a different account or provider and, for object storage, features like versioning and write-once retention.
- Test restores. A backup you have never restored is a hope, not a plan. Schedule a restore test, at least for the data you can’t afford to lose.
- Encrypt backups on your side before upload if they contain anything sensitive, and keep the key somewhere separate and safe.
- Know the retention. Decide how many versions and how many days you keep. Longer retention costs more but protects against problems you notice late.
A Simple Decision Process
- Define what you are storing: documents people edit, media, application data, or backups, and how much now and in a year.
- Pick the category from the table at the top.
- List your hard requirements: encryption model, compliance, regions, integrations, admin controls.
- Estimate cost at your real usage including requests and egress for object storage, and per-user costs for team plans.
- Trial with real data (a free tier, a small bucket), including a restore and a leave-and-export test.
- Set up protection: two-factor authentication, sharing rules, a billing alert, and a backup.
Is cloud storage the same as backup?
No. Sync services mirror changes across devices, so deletions, corruption and ransomware can spread. Backup keeps separate, versioned copies you can restore from. Use both, and follow the 3-2-1 rule: three copies, two kinds of storage, one off-site.
Is Google Drive or Dropbox or OneDrive better?
For core file sync they are similar, so choose by ecosystem and needs: Google if your team lives in Google Workspace, OneDrive if you are on Microsoft 365, Dropbox if you want a neutral cross-platform tool. Compare current plans and admin controls for your region and team size.
Is my data really private in cloud storage?
Most mainstream services encrypt your data but hold the keys, so the provider can technically access it. End-to-end encrypted options exist, such as Apple’s optional Advanced Data Protection, but they limit features like web search and mean the provider cannot help you recover data if you lose your keys.
What is the cheapest way to store a lot of data?
For application or archive data, object storage with low or free egress, such as Cloudflare R2 or Backblaze B2, is often cheaper than the large clouds, depending on how much you download. Calculate storage, requests and egress for your own workload before deciding.
Why is egress such a big deal in object storage?
Most large providers charge for data leaving their network. If your application serves big files to many users, transfer charges can exceed storage charges, and they can also make switching providers costly.
