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
Onspring Audit Software - Onspring Audit Software is a platform that promotes efficiency and transparency across the internal audit and assurance process.
Google Drive - Access and sync your files anywhere
Tandem Software - Tandem Software is a platform that offers services in audit management to users to help them in managing all aspects of their audits and exams with Tandem.
Mega - Secure File Storage and collaboration
Audit Prodigy - Audit Prodigy is a SaaS Audit, Compliance and Risk-Management Platform for mid-size teams. It offers easy-to-use and integrated capabilities to streamline Audit, SOX, ERM, Issues, Flowcharting, Compliance