Dropbox is the standard for cloud storage. However if you need a secure solution, you should look elsewhere.
Most cloud storage providers tell you they will do everything for your documents’ security. Unfortunately, this is simply not true.
Even if Dropbox encrypts your files in transit and at rest, it keeps access to your keys and decrypts files in order to read them.
They do it because many features couldn’t work without it.
This means that you are not the only one who can access your files.
This is not cool.
Try Cubbit as a safest Dropbox alternative.