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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.
Startup Security Program by Templarbit - Security practices & tools required to close large deals
Dropbox - Online Sync and File Sharing
Google Capture the Flag 2017 - Google's 2nd annual worldwide security competition
Google Drive - Access and sync your files anywhere
The Security Checklist - The Practical Security Checklist for Web Developers
Mega - Secure File Storage and collaboration