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.
DigitalOcean - Simplifying cloud hosting. Deploy an SSD cloud server in 55 seconds.
Dropbox - Online Sync and File Sharing
Amazon EC2 - Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.
Google Drive - Access and sync your files anywhere
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.
Mega - Secure File Storage and collaboration