iWeb - Location of iWeb File (For Backup)

So, I just learned where iWeb stores its files: 

~/Library/Application Support/iWeb/Domain

 

Note that this is one file instead of a bunch of them.

 

I've a different version of iWeb on my Macbook than I do on my iMac.  I'd like to begin using my iMac to develop my web pages.

 

Another thing I should do is find out how to upgrade some of the Apple software on my Macs.