Clones repositories in RPM-MD format with optionally selecting just needed architectures. Written in Python-3.6+. Tested on OpenSUSE-Leap repositories. Inspired by rrclone perl tool.
rrepo-clone.py --arch x84_64 --arch noarch http://source/repo/ path/to/destination/folder/
Python3 environment with at least 3.6 version of python running under any OS (Windows, Linux, etc). Python modules required: Requests and several standard ones.
You need a correct path to repository. For example, take it from a .repo-file (located in '/etc/yum.repos.d' (RedHat) or '/etc/zypp/repos.d' (SUSE) dirs) as a string after "baseurl=". To check that url is correct you can try to download part of repository xml metadata. Put your string into browser address bar and append "/repodata/repomd.xml" (no quotes) and if you see xml text then the url is correct.
By default, the rrepo-clone downloads packages for all architectures available. If only several are required (e.g. 'x86_64' and 'noarch'), provide one or many --arch <name> options in the command line.