Please use https://wordpress.org/plugins/storagemadeeasy-multicloud-files-backup/. This plugin is deprecated and no longer maintained.
Please note the following with this Plugin
SMEStorage Multi-Cloud WordPress backup is based on "WP-DB-Backup" (http://wordpress.org/extend/plugins/wp-db-backup/). This plugin is licensed under GNU GPL, version 2. (http://www.fsf.org/licensing/licenses/gpl.html). This Plugin's use of SMEStorage is based upon SMEStorage's multi-cloud API. Source code is available from http://code.google.com/p/smestorage/.