OK...this may be a silly question, but I want to be sure.

I've used VMWare on Windows and know that the image created is just one big file that can easily be saved off and put back on/used at any time.

I want to try Virtualbox here on Ubuntu. Does it work the same way? I ask because I will scrub Ubuntu and do a clean install at some point (now that I know better what to install, not install, where to put things, etc...).

I want to make sure I can just save off the Windows image I create and reinstall Virtualbox with the new ubuntu (when that happens) without having to reinstall Windows to create the image again.

This is totally true/doable, right? I suspect so, but want to be sure as I've never used Virutalbox, only VMWare.