wp-dbmanager

I do not have a child theme. seemed like there was a glitch with skt girlie theme child theme. when using it to load to the pro theme, everything was off. So I didn’t use it, and just updated the skt girlie pro theme to make all changes including custom. Can you tell me if wp-db manager will back everything up, then if I do an update, can i reload all from backup and all be good on my site? I didn’t know if wp-db manager was only for certain parts of the site, or if it would take care of everything (the theme, custom changes, etc.) I’m new to all this, so any help would be greatly appreciated. thank you.