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
Ansarada - Turn deal chaos into order with Ansarada’s Virtual Data Room.
Google Drive - Access and sync your files anywhere
DealRoom - M&A Lifecycle Management Software
Mega - Secure File Storage and collaboration
Devensoft - Financial Services