What are some alternatives?
When comparing Cloudu and Dropbox, you can also consider the following products
Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
Google Drive - Access and sync your files anywhere
FlowCloud - FlowCloud is online cloud storage GET 120GB FREE!
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
Syncany - Syncany is an open-source cloud storage and filesharing application.
Mega - Secure File Storage and collaboration