This file area is available using rsync, so to mirror it use:

	rsync -az --delete ftp.squeak.org::files/ /mydir

	-a        = archive mode, preserves timestamps, owners etc.
	-z	  = use compression
	--delete  = delete removed files

And perhaps using --bwlimit (limit in kb/s).

Typically add a script with the above line in /etc/cron.d/daily/ or add a line in /etc/crontab
(or a file in /etc/cron.d/) with:

5 3    * * *   root    /usr/bin/rsync -az --delete ftp.squeak.org::files/ /home/sqfiles/

...in order to run it 3.05 each night.