This is an online cloud storage offered by Google and is similar with Dropbox, but offers more storage plans. Users can use Google Drive to securely backup their files and is completely free up to 15 GB.
More storage space the 15 GB is paid, but with pretty cheap rates.
This service has an installer that will synchronize automatically all files that you put in your local hard drive on “Google Drive” folder with secure servers where data will be uploaded when you add, delete or edit files. Being a service of Google, if you use their Gmail email service and Google+ social network you will have automated backups for email attachments and personal photos.