Google Drive for WordPress is a free wordpress plugin to make backups of your WordPress files and Mysql DB in zip format with Google Drive.
To install Google Drive for WordPress
Login to wordpress (wp-admin).
In your admin dashboard click plugins and select Add New.
Type Google Drive for WordPress in the search field and click Search Plugins button.
Install Google Drive for WordPress.
After the successfully Installation click the activate Plugin link to activate the plugin.
[OR]
Download Google Drive for WordPress wordpress plugin. Download link
Unzip and upload it to your WordPress wp-content/plugins directory.
Login to wp-admin. In your admin dashboard click plugins and activate the Google Drive for WordPress plugin