What is cloud storage?
Cloud storage is a service that keeps your files on a company’s servers, so you can open, sync and share them from any device with internet access. You upload files through an app or website, and the provider stores copies across data centres. Popular examples include Google Drive, iCloud Drive, OneDrive and Dropbox.
Cloud storage has become the default place for documents and photos, yet many people are unsure what it does and does not do. This guide explains it in plain terms, from how files travel to what you really pay.
| Provider | Free space | Example paid plan (US) | Built into |
|---|---|---|---|
| Google Drive (Google One) | 15 GB shared with Gmail and Photos | 100 GB for $19.99 per year | Android, Chromebooks |
| iCloud Drive (iCloud+) | 5 GB | 200 GB for $2.99 per month | iPhone, iPad, Mac |
| OneDrive | 5 GB | 100 GB for $19.99 per year | Windows |
| Dropbox | 2 GB | 2 TB Plus plan | None, works on all |
| Proton Drive | 5 GB | 200 GB for $4.99 per month | None, privacy-focused |
Prices from official provider pages, checked October 2026.
How does cloud storage work?
Cloud storage works by copying files from your device to remote servers over an encrypted internet connection. The provider stores your data on many disks, often in several locations, so one failure does not lose it. An app keeps your devices and the cloud in step.
- You save a file into a cloud folder or upload it on the website.
- The app encrypts the transfer and uploads the file.
- The provider stores it on redundant servers, encrypted at rest.
- Your other devices download the change, or show it as online-only.
Behind the scenes, providers pool huge numbers of physical disks into shared storage. Our explainer on virtualized storage and the article on the cloud file system show how that works.
Cloud storage vs cloud backup
Cloud storage holds and syncs files you choose. Cloud backup copies your whole device automatically and keeps older versions. With storage, deleting a file on one device deletes it everywhere after the trash empties. Read the full comparison in cloud backup vs cloud storage.
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Get the checklistWhat does cloud storage mean for your privacy?
With most cloud storage, the provider encrypts your files but also holds the keys. That protects against outsiders, but the provider could access files in limited cases, such as legal orders. End-to-end encrypted services remove that possibility.
Where the company is based also matters. Most big providers are US companies. Proton and pCloud are Swiss. See cloud data privacy for what that changes, and cloud data security for the technical side.
Common myths about cloud storage
- “Files in the cloud are backed up.” Only if the service keeps versions long enough, and you have another copy.
- “Free storage is enough.” Photos usually outgrow free tiers within a year or two.
- “The cloud is one computer somewhere.” It is many data centres with redundant copies.
- “Deleting the app deletes my files.” No. Files stay in your account until you delete them.
What should you check in a provider?
Check five things: free and paid space, price per terabyte at renewal, version history and trash length, encryption model and app support for all your devices. Sharing controls and offline access matter too if you work with others.
See ranked options in best cloud storage, pricing in cloud cost and free tiers in free cloud storage. To see what uses your current space, read check cloud storage.
Frequently asked questions
What is cloud storage in simple words?
Cloud storage is online space for your files. Instead of keeping documents and photos only on your phone or computer, you save them to a company’s servers through the internet. You can then open them from any device, share them with others and free up space locally.
Why does cloud storage matter for privacy?
Your files sit on servers owned by someone else. Most providers encrypt files but hold the keys, so they could access data in limited cases. If privacy matters, choose end-to-end encrypted storage, protect your account with two-factor login and check where the company is based.
How do I check cloud storage features in a provider?
Read the provider’s plan page for space and price, its help pages for version history and trash periods, and its security page for encryption details. Test the free tier on every device you use. Look at renewal prices, not only first-year offers.
Is cloud storage safe?
Reputable cloud storage is very reliable, with copies across several data centres. The main risk is your account being taken over. Use a unique password and two-factor authentication. For important files, keep a second copy outside the same account.
How much cloud storage do I need?
Most people need 100 to 200 GB for documents and a few years of photos. Families with large photo and video libraries often need 2 TB. Check your current usage, add room for two years of growth and pick the closest plan.
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