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 Notes - Most actionable advice from each Startup School speaker
Dropbox - Online Sync and File Sharing
Great F*cking Startup Advice - Strongly worded suggestions for startup founders
Google Drive - Access and sync your files anywhere
Startup Fucking Advice - A humor-based website that gives random startup advice.
Mega - Secure File Storage and collaboration