The Convenience and Risks of Cloud Storage
Google Drive, Dropbox, iCloud, OneDrive — cloud storage is widely used by individuals and businesses alike for the convenience of accessing files from any device. However, entrusting your data to a third party's servers carries inherent risks.
When thinking about cloud storage security, understanding the balance between "convenience" and "safety" is the starting point.
Risks Lurking in Cloud Storage
Account Takeover
Access to cloud storage is typically protected by an email address and password.
If your password is compromised, every file you've stored is at risk. It's not uncommon for credentials leaked through data breaches to be exploited in this way.
Misconfigured Sharing Settings
Leaving sensitive files with a sharing setting of "Anyone with the link can access" is a mistake that happens frequently. If a shared link is unintentionally distributed, an unlimited number of people could gain access to the file.
Risks on the Provider's Side
Cloud storage providers themselves can be targets of cyberattacks. Additionally, if the provider's employees have access to your data, there is a risk of insider misuse.
Legal Jurisdiction Issues
Depending on the country where the servers storing your data are located, your data may be subject to disclosure under that country's laws.
How to Use Cloud Storage Safely
Strengthen Your Account Security
- Set a strong, unique password
- Always enable two-factor authentication
- Regularly review your account activity logs
- Revoke unnecessary third-party app integrations
Manage Sharing Settings Properly
- Periodically review sharing settings on files and folders
- Share with specific users rather than "Anyone with the link"
- Set expiration dates on shared links (if the service supports it)
- Promptly revoke sharing that is no longer needed
Encrypt Important Files
By encrypting files locally before uploading them to the cloud, you prevent third parties — including the service provider — from reading the contents. Tools like Cryptomator and VeraCrypt are available for this purpose.
Choose Services with End-to-End Encryption
Some cloud storage services offer end-to-end encryption (E2EE). With E2EE, data is encrypted on your device, and not even the service provider can read the contents.
Cloud Storage as a Backup Strategy
Cloud storage is useful as a backup destination, but it should not be your only one. Follow the "3-2-1 rule" discussed in our ransomware protection guide — maintain backups on both cloud and local storage (such as an external hard drive).