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
Envoy - Visitor registration that's changing how guests are greeted in companies around the world.
Google Drive - Access and sync your files anywhere
Proxyclick - Connect with Confidence
Mega - Secure File Storage and collaboration
TractionGuest - Safe, secure workplace for all.