How to back up to the cloud securely?

Ensuring the maximum level of security when transferring data to cloud storage requires a comprehensive approach and the use of modern cryptographic tools. The first rule of security is to encrypt all files directly on your device before they are sent to the cloud. Special utilities like Cryptomator, which create client-side encrypted containers, are great for these purposes.

The second effective protection method is choosing cloud providers that use a zero-architecture or zero-knowledge encryption approach. Popular services like Tresorit or SpiderOak are designed in such a way that even server owners and developers do not have the technical ability to read your files or access the decryption keys. Your data belongs only to you and is protected by your personal master password.

The third level of protection concerns your cloud service account directly. Be sure to come up with a complex, unique password consisting of mixed-case letters, numbers, and special characters, and enable two-factor authentication via a mobile app or hardware key. This will block attackers' attempts to log into the account even if your password is compromised.

The fourth security rule states: never store the only copy of important documents exclusively in the cloud. Apply the three-copy rule by leaving a local duplicate on an external hard drive. The fifth point concerns privacy—regularly check sharing and file access settings so that an accidental link does not make your personal archives publicly available on the internet.