Use
Vapor. It works just as well for making a package of any site and installing the resulting package on any other site.
1. Install a new MODx on localhost
2. Upload and run Vapor on the MODx Cloud per instructions on Vapor page - use the (S)FTP/HTML method. Ignore the part about importing.
3. Download the package and put it in your new local site's core/packages.
3. Install from local like any other package in Package Manager.