Akeeba backup (and Admin Tools for that matter) is one of the components that I consider a standard must-have for any Joomla installation. It's easy to use, powerful and gives peace of mind for your sites. I use the integrated Amazon S3 storage function to keep the backup files on a different server for better redundancy. Between that and using a host with regular backups (like Rochen) I don't lose sleep worrying about my data. There are too many advantages to list about this tool. The ability to move sites is a huge advantage.