For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Dropbox - Online Sync and File Sharing
CloudMe - Key Features: - Access to all your files and folders in CloudMe. - From 3GB (free) to 500 GB (paid) of file storage, accessible directly in your device. - View photos, videos, and documents wherever you are.
Google Drive - Access and sync your files anywhere
CloudTop - CloudTop is an online cloud web desktop.
Mega - Secure File Storage and collaboration
eyeOS - eyeOS is a web desktop following the cloud computing concept that seeks to enable collaboration and communication among users.