[Yum] How far back does the repo keep old RPM's?

[John Lee]

General question here for a total newbie here, but how far back does the centos repository keep its RPM's?

For example, if a new version of cups-devel comes out, what happens to the previous version of the cups-devel RPM?  Does it remain in the repository?  Does it get overwritten?  What if we have to revert back to the older version of the RPM?

Thank you....

J
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