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.
N2WS Cloud Protection Manager - N2WS is the leading Enterprise-class disaster recovery, and backup solution specifically made for Amazon EC2 servers.
Dropbox - Online Sync and File Sharing
Bacula Enterprise - A physical, virtual and cloud data center backup software for data centers. Bacula Enterprise Edition is the best open source backup software.
Google Drive - Access and sync your files anywhere
Nuabee DRaaS - Nuabee DRaaS is an online file backup software that helps your IT business protect your important files and documents across all data centers.
Mega - Secure File Storage and collaboration