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
Knox - Knox offers easy disk image encryption and comes with a built-in backup service.
Google Drive - Access and sync your files anywhere
Exocet - Exocet creates a Folder on your System.
Mega - Secure File Storage and collaboration
Advanced File Security Basic - Download Advanced File Security Basic. Protect files by encrypting them with a strong password, a series of questions, or even an USB key you can carry around with this powerful security solution