I have purchased licenses from two of the most popular backup plugins to pay for the ability to migrate using them. They work. They are also somewhat finicky when it comes down to restoring or migrating. But, indeed, they do work.
However, Darwin is pure genius. Simple. Reliable. Easy to set and forget. Aleksandr is working on off-server storage of the backups to AWS as I understand it and that is the only "feature" missing from this plugin.
Even so, currently you can get the backup link emailed to you, copy it to the clipboard,or download the backup from the admin end of WordPress. You can also download the backup via ftp and store it in your favorite off-site cloud. So, you have options until the off-site storage feature is complete.
To top it all off, IT REALLY IS FREE! ALL FEATURES! No paying for the extras.
As to support, I have not experienced support as professional, thorough and prompt as Aleksandr provides. There are several plugin developers providing great support, but very few of those are as complete, timely, and helpful as Aleksandr. He communicates! Even if he doesn't have an immediate answer he will tell you so and when you can expect it.
Aleksandr and Darwin Backup are the true cream of the crop.
I am an independent Artist painting in oils. I developed my own site with WordPress and I have recieved NO compensation for what I wrote here. You can trust it to be true and written from personal experience.