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
Kruptos - Lock and encrypt your photos, movies, files and folders using 256-bit file encryption.
Mega - Secure File Storage and collaboration
R-Crypto - R-Crypto is smart data security and disk encryption software that allows you to secure your sensitive information via strong encryption.