You can get a raw text version of a page using an URL like that one: http://larpwiki.org/cgi-bin/wiki.pl?action=browse&raw=1&id=BackUp
I do nightly (well, for every night I leave my box running) backups with the following perl script. Use at own risk.
Tilmann is probably doing some server side backups as well.
--RalfHuels, 2004-04-26
#!/usr/bin/perl -w
# Warranty void
# RalfHuels, 25.4.2004
chdir '/home/spambin/wiki.org';
$seiten=`wget -q -O - http://larpwiki.org/cgi-bin/wiki.pl?action=index`;
$seiten=~s/^.*\/h2><p>//s;
$seiten=~s/<\/p><div.*$//s;
$seiten=~s/<br \/>/\n/sg;
@seiten=split /\n/,$seiten;
foreach $line (@seiten){
$line =~ s/^<a .*>(.*)<\/a>/$1/;
$line =~ s/ /_/g;
print "$line\n";
`wget -O "$line.txt" "http://larpwiki.org/cgi-bin/wiki.pl?action=browse&raw=1&id=$line"`;
sleep 10;
}`tar jcv --remove-files -f wiki\`date +%F\`.tar.bz2 *.txt`