Although public clouds as Dropbox, Google Drive or OneDrive are free and easy to use, you should avoid them for sharing sensitive files, photos or other data. You have no control what happens with your documents in the cloud, and you are dependent on the provider keeping your information secure.
An alternative cloud-based solution with an automatic encryption of the stored data is ‘BlauCloud’. The service is based on the open-source cloud solution ‘ownCloud’. As the data is stored in Germany, users benefit from the restrictive German data security law. But even this more secure method means you are entrusting the host with your data.
A better way to store data remotely is to create your own private cloud through a NAS (Network attached Storage). However, a NAS is not free or inexpensive. This video explains how NAS operates:
This video discusses the main differences between a cloud and a NAS considering the aspects of security, access, costs, and sharing: