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.
Microsoft Cloud App Security - Microsoft Cloud App Security provides deeper visibility, comprehensive controls, and enhanced protection against cloud security issues.
Dropbox - Online Sync and File Sharing
Trend Micro Cloud App Security - Trend Micro Cloud App Security delivers advanced threat and data protection for Office 365 and cloud file-sharing services.
Google Drive - Access and sync your files anywhere
Duo Security - Duo Security provides cloud-based two-factor authentication. Duo’s technology can be deployed to protect users, data, and applications from breaches, credential theft, and account takeover.
Mega - Secure File Storage and collaboration