I want to create a private mirror for CentOS 6.6. Is there any mirror supporting rsync that provides an old point release? I do know that CentOS does not recommend sticking to a point release. This local mirror will be used to ensure that the software that we use is common across several systems. We will update all of them together whenever this is decided.
The public mirrors have the packages removed. However, they are stored on vault.centos.org so you should be able to get what you want from http://vault.centos.org/6.6/.
The vault readme.txt has this to say on rsync
The Following External Vault mirrors (not monitored by the CentOS Infra team !) also provide direct downloads for all content, including isos and rsync access: