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.
Encrypto - Encrypto lets you encrypt files before sending them to friends or coworkers.
Dropbox - Online Sync and File Sharing
VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
Google Drive - Access and sync your files anywhere
TrueCrypt - TrueCrypt is a leading cross-platform that provides encryption tools that allow you to migrate any encrypted data to virtual disks images on your systems.
Mega - Secure File Storage and collaboration