Cloud Storage: What Is It?
Cloud storage is a service that keeps your files on a provider’s remote servers instead of only on your own device. You reach those files over the internet from a computer, phone or browser. Most consumer services, such as Google Drive, OneDrive, iCloud Drive and Dropbox, add sync, sharing and version history on top of the storage.
| Question | Short answer |
|---|---|
| Where are my files? | In the provider’s data centres, usually copied across several disks and sites |
| How do I reach them? | Desktop apps, mobile apps or a website |
| How much is free? | Typically 2 GB to 15 GB, depending on the provider |
| Is it a backup? | Not on its own; most services sync deletions |
| Who can read my files? | Usually the provider holds the keys, unless the service is end-to-end encrypted |
| What does it cost? | Free tiers, then monthly or yearly plans by size |
How Cloud Storage Works
When you save a file to cloud storage, an app sends it over an encrypted connection to the provider’s servers. The provider stores it, often splitting it into pieces and keeping copies on several disks or in several data centres. That redundancy protects against hardware failure.
Your devices then download the file when needed. Sync apps keep a copy on each device and update it when anything changes. Our file sync pillar explains the sync side in detail.
The Main Types of Cloud Storage
- Personal cloud storage with sync: Google Drive, OneDrive, iCloud Drive, Dropbox, pCloud. Built for everyday files.
- Cloud backup: services that copy your whole computer and keep versions, such as Backblaze. See back up to the cloud.
- Object storage: developer services like Backblaze B2, Google Cloud Storage and Amazon S3, used by apps and backup tools.
- Private or self-hosted cloud: a NAS or server you own, with cloud-style apps. See cloud NAS.
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What Cloud Storage Means for Privacy
Every major provider encrypts data in transit and on its servers. The key question is who holds the encryption keys.
- Provider-held keys: Google Drive, OneDrive, Dropbox and iCloud with standard data protection. Convenient, and the provider can help you recover access.
- End-to-end encryption: services such as Proton Drive and Sync.com, or iCloud with Advanced Data Protection. Only your devices hold the keys.
Server location and the company’s home country also decide which laws apply. Read our cloud privacy guide for details.
Common Myths About Cloud Storage
“The cloud is just someone else’s computer.” Partly true, but it is a fleet of computers with redundancy and security teams that a home user cannot match.
“Files in the cloud can’t be lost.” They can be deleted by you, a synced device, a shared user or ransomware. Keep a separate backup.
“Free storage is enough.” Free tiers fill quickly once photos, email or backups share them.
“All cloud storage is the same.” Limits, privacy models and sync behaviour differ a lot. See cloud storage limitations.
What to Check in a Provider
- Free and paid storage sizes, and what shares the quota.
- Apps for every device you own.
- Version history and recycle bin length.
- Encryption model and who holds the keys.
- File limits such as maximum file size and path length.
- Sharing controls, like link expiry and passwords.
Compare providers in our file sync tools guide, or see how much each gives away in free cloud storage. To understand how storage and sync fit together, read cloud storage and sync.
Frequently Asked Questions
What is cloud storage in simple terms?
Cloud storage is space on a company’s servers where you can keep files and reach them over the internet. Instead of saving a document only on your laptop, you save it to a service like Google Drive or OneDrive. You can then open it from your phone, another computer or a web browser.
Is cloud storage safe?
Major providers protect data with encryption, redundant storage and security teams, which makes hardware loss unlikely. Most risks come from weak passwords, phishing, oversharing and ransomware on your own device. Use a strong password, two-step verification and careful sharing, and keep a separate backup of important files.
What is the difference between cloud storage and a hard drive?
A hard drive stores files on a physical device you own and can lose, break or have stolen. Cloud storage keeps files on a provider’s servers, reachable from any device with an internet connection. Many people use both: local drives for speed and cloud storage for access and an offsite copy.
How much does cloud storage cost?
Most providers offer a free tier between 2 GB and 15 GB. Paid plans are billed monthly or yearly by size, from around 50 or 100 GB up to several terabytes. Prices vary by provider and country and change over time, so compare current plans pages before you buy.
Can I use cloud storage without internet?
Partly. Sync apps keep copies of files on your device, so you can open and edit them offline, and changes upload when you reconnect. Files set to online-only need a connection. Phone apps let you mark files as available offline before you lose signal.
Keep your files safe and in sync
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