WordPress has several plugins for backup and restore. But this plugin which you will download from my website is not developed by me. It completely belongs to the Dropbox website and designed by them.
In 2019 the plugin came to an end from the WordPress repository by Dropbox Inc. they have stopped the plugin development and removed the old plugin from the wrodpres.org website. I am using this plugin for 4 years since it launched and never deleted it from my website. So I have this plugin and providing you access to download the same.