CryFS encrypts your files, so you can safely store them anywhere. It works well together with cloud services like Dropbox, iCloud, OneDrive and others.
Easy to setup and works with a lot of cloud storage providers. It runs in the background - you won't notice it when accessing your files in your daily workflow.
Your data only leaves your computer in encrypted form. File contents, metadata and directory structure are all secure from someone who hacked your cloud.