Please don't delete distributions from the CPAN … There are very valid reasons why someone might need to come back and fetch your last version released

Wouldn't BackPAN be sufficient for this purpose?

(Any time I upload to pause.cpan.org, a message is displayed encouraging me to clean up outdated distributions to help reduce the storage burden for CPAN and its mirrors. It assures me that users can always find old versions on BackPAN, as it intends to be a permanent archive that only under exceptional circumstances might a distribution be deleted from it.)