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
CrossFTP - CrossFTP is a powerful FTP and Amazon S3 client. DownloadDownload CrossFTP/Pro/Enterprise for Windows, Mac . FeaturesCrossFTP.
Google Drive - Access and sync your files anywhere
Storage Made Easy - The leading Enterprise File Share and Sync solution
Mega - Secure File Storage and collaboration
S3Fox Organizer - The S3Fox Organizer(S3Fox), offers the ability to upload or download files to and from Amazon S3.