Many are crossposted to news.answers.  That newsgroup should have a
long expiry time at your site; if not, talk to your sysadmin.

FAQ lists are in http://www.faqs.org/faqs/ and ftp://rtfm.mit.edu
The comp.compression FAQ that you are reading is in
  http://www.faqs.org/faqs/compression-faq/part1/preamble.html
  http://www.cis.ohio-state.edu/hypertext/faq/usenet/compression-faq/top.html
  ftp://rtfm.mit.edu/pub/usenet/news.answers/compression-faq/

If you don't have FTP access, you can access the archives by mail
server.  Send an email message to mail-server@rtfm.mit.edu
containing the commands
    send usenet/news.answers/compression-faq/part1
    send usenet/news.answers/compression-faq/part2
    send usenet/news.answers/compression-faq/part3
For instructions, send an email message to the same address with the
words "help" and "index" (no quotes) on separate lines. If you don't
get a reply, check your return address, or add a line such as
    path myname@foo.edu

Some parts © 2009 Advameg, Inc.