hmm... write a script on the server that is launched daily using the cron (man crontab)... have that script ftp to your workstation or wherever and grab the file. The automated FTP will probably require a .netrc file in your user directory or wherever you ftp to to get the file.
However, if you are having to tar the file manually every day, write a script on the workstation side to do that for you a few minutes before the server script executes... once again, utilizing the crontab.
Good luck and let me know how it goes.
Strange... those other replies both popped up while I was writing... ummm... take their advice.