If Dotdeb is useful for you and if you want to mirror it, just add a cron job to periodically fetch the packages :
rsync -a --delete rsync.dotdeb.org::packages/ /your/local/path/
Note 1 : mirroring once a day should be enough. More frequent updates could lead to a ban without any warning.
Note 2 : Using anything else than Rsync (Wget, HTTrack…) could lead to a ban without any warning.