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.
LiveDrive - Unlimited online backup storage for your PC or Mac with a 14-day free trial
Dropbox - Online Sync and File Sharing
NovaBackup Software - NovaBackup Software is a cloud-based backup software that is intended for the windows system, allowing you to store your files, documents, and much more.
Google Drive - Access and sync your files anywhere
Mozy home - Mozy home is one of the effective and secure online Backups that allows you to keep your documents saved all the time, even there is a disaster with the system.
Mega - Secure File Storage and collaboration