It does EXACTLY what is says it does. It is fantastic. The documentation is outstanding.
-- Read the instructions (or if you are like me... at least load the pdf file and search it for your issues, the answers are there).
-- I am using the core install, but will soon upgrade to the plus version because I have joomla nested in directories, and I want to back those up separately, so I need to exclude them from my site backup.
-- If you have a standard joomla install, with no sub directories, this is really a great solution.
Last year I paid someone to move my site for me because I didn't have the time to research how, this would have solved that for me.
I cannot say enough good things about this extension. Thank you so much!