Every now and then, link new releases to the project history.

cd /home/ftp/mirrors/postfix-release/official
find . -links 1 -name '*.gz*' -exec ln -f '{}' /home/ftp/mirrors/project-history/postfix/official ';'

cd /home/ftp/mirrors/postfix-release/experimental
find . -links 1 -name '*.gz*' -exec ln -f '{}' /home/ftp/mirrors/project-history/postfix/experimental ';'