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
Clonezilla - Clonezilla is a suite of software that's designed to allow you to back-up and image new hard drives with your data.
Google Drive - Access and sync your files anywhere
Macrium Reflect - Macrium Software - the creators of Macrium Reflect backup, imaging and cloning software.
Mega - Secure File Storage and collaboration
AOMEI Backupper - AOMEI Backupper is a software created to help a person backup, restore, clone, and sync their entire Windows system.