UPDATE: I had to change my review because I'm suffering this bug and the plugin doesn't work well anymore. I'll change the review again if the bug is fixed.
UPDATE 2: I've stopped using this plugin and created a bash script that does the same. Therefore, I keep the last rating I gave.
This is definitely the best backup plugin I've tried, does exactly what I ever wanted.
Those whom the scheduled backup doesn't work, read the FAQ, it's usually the hosting's fault and not of the plugin. Simply divide the backup into several small jobs instead of a large unique job, and increase the number of retries to 99. That worked for me.