https://wordpress.org/plugins/duplicator/
The Duplicator gives WordPress administrators the ability to migrate, copy or clone a site from one location to another. The plugin also serves as a simple backup utility. The Duplicator supports both serialized and base64 serialized string replacement. If you need to move WordPress or backup WordPress this plugin can help simplify the process.
https://wordpress.org/plugins/cyan-backup/
Backup your entire WordPress site and its database into a zip file on a schedule. Remote storage options include FTP, SFTP and FTPS. Its basic, but does exactly what you need.