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
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
Google Drive - Access and sync your files anywhere
Symantec Data Loss Prevention - Fully protect your data with the comprehensive detection technologies and unified policies of Symantec's industry leading Data Loss Prevention (DLP).
Mega - Secure File Storage and collaboration
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.