• Open up Xsitepro and click once on the site you want to export, but don't open the site.
• Then, go up to the "Export" button at the top of the menu and click on it.
• Next, name the file and save it to your hard drive. What this does is it takes your entire site, the pages, images, etc. and compresses it into one single file.
• Now, you can easily take that file and email it to yourself or burn it onto an external backup source (such as an external drive).
• When you open up Xsitepro onto your second computer, all you need do is open up the software, and then click on the "Import" button from the Project Selection Tree.
• Search for the .xse file(s) you just created and you can now easily import that file into Xsitepro.

You can find the manual section on creating XSE files, and the website import & export function here:
http://www.xsitepro.com/help/importexport_xsitepro_website_design_xsitepro_website_design.htm