Interesting overview, some have to look into. But nobody/nothing mentions the option of the application handling the data you want to backup, to perform the backups.

Imho it's ideal to have the application handling the data also create the backups. And then transport them to remote locations via any means viable or any of the in the article mentioned backup systems again. Though having the application back things up vs backup software, i tend to think there is less tuning required, less chance on external locks etc etc.