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
Viedoc - EDC, ePRO, eCRF, eTMF, CDMS, electronic data capture, clinical trial and PMS software
Google Drive - Access and sync your files anywhere
Medidata CTMS - Medidata CTMS seamlessly integrates with Medidata Rave to provide real-time views into study progress without manual tracking.
Mega - Secure File Storage and collaboration
Veeva CRM - Veeva Systems - Cloud-Based Business Solutions for the Global Life Sciences Industry