This plugin worked great until I tried to test a WP downgrade. The reason for this test was to see what would happen if a plugin was incompatible with the newest version of WordPress, could I use a back up plugin to downgrade back to a stable version? Unfortunately the most recent version of WP, 5, removes manual backup functionality of this plugin. Further, I was unable to restore my WP 4.3.3 version with the backup files. I had to manually downgrade WP to get WP Backup working properly again.
Also, Dropbox linked up easy enough, but never saved any backups there.
For these reasons I can only give the plugin a 3 star.
Stable on WP 4.3.3.
<EDIT> Ooops, I didn't do the stars right. And editing the post I can't change my rating - that's useful Wordpress.org!<EDIT>