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.
Folder Lock - Folder Lock is a security software that helps you to password protect files, shred files, clean history, encrypt the personal documents and much more.
Dropbox - Online Sync and File Sharing
Vov Hide Files - Lock your files and folders from prying eyes.
Google Drive - Access and sync your files anywhere
Wise Folder Hider - Wise Folder Hider is a free file/folder hiding tool.
Mega - Secure File Storage and collaboration