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.
The Security Checklist - The Practical Security Checklist for Web Developers
Dropbox - Online Sync and File Sharing
SafeBase - SafeBase is the interactive security portal to share your security posture, automate access to sensitive compliance information, and subscribe to vendor security program updates.
Google Drive - Access and sync your files anywhere
WordPress Security Scanner - Check if your WordPress site has known vulnerabilities
Mega - Secure File Storage and collaboration