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
Clara - Clara is a virtual employee that schedules your meetings, getting you to the work that matters, faster.
Google Drive - Access and sync your files anywhere
Mia - Virtual assistant for meetings
Mega - Secure File Storage and collaboration
Mastermind Manager - Software for running mastermind groups