Cloud services ... 

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... are connected to the Internet, so you can access the stored data at any time and from anywhere with an Internet-enabled device.

... can also make data available to third parties without much effort, enabling collaborative work on documents. 

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Ensure adequate basic protection of the access device.

Secure access to cloud services with a strong password or, if possible, a second factor.

Choose cloud providers carefully. Check how they process the data, what rights you grant them and what happens if they lose the data. 

If you upload personal data, make sure it is encrypted. When sharing data with other people, consider the manner in which you’re sharing it and only share as much data as necessary.