[CentOS] What are the differences between CentOS Linux and CentOS Stream?

> On Dec 15, 2020, at 12:13 PM, Matthew Miller <mattdm at mattdm.org> wrote:
> 
> On Tue, Dec 15, 2020 at 05:09:39PM +0000, Bernstein, Noam CIV USN NRL (6393) Washington DC (USA) via CentOS wrote:
>>> 3. 'dnf downgrade foo' doesn't work as only latest/one copy of each package in Stream repository so no opportunity to downgrade/roll back broken packages.
>> Really? I hadn't appreciated that.  How does one the contribute back to RH/the community by checking at what point something broke?
> 
> I don't know the answer here but it's a good point to raise. In Fedora, we
> don't keep all updates on our mirrors either, but we _do_ make them
> accessible forever from our build system
> (https://koji.fedoraproject.org/koji/), and there's a command-line tool for
> easily pulling the packages from a build.

It also makes my idea of reproducing RHEL point releases by just applying a selected subset much harder.  You have to regularly download everything, and create a local comprehensive repo.