Check this old question I posted a while ago ...
The short answer is, if you want this data for longer periods of time (i.e. > 48 hrs), you have to get in touch with DWD. They will retrieve it for you from their archives ... for a fee. After I got this information, I set up an hourly cron job for the first of your links, because I was simply interested in having such data for a longer (yet not specific) period of time:
su -c "lftp -c \"set ftp:list-options -a;
mirror --use-cache --verbose --allow-chown --allow-suid --no-umask --parallel=4\"" someusername
My "personal archive" reaches back to noon (UTC) 2017-08-05 (39k files, 36 GByte) ;)