Generate daily HEAD snapshots.  Basically setup the config file and
    these files in ~root/snapshots and add a root cron job:

    23 2 * * *      cd /root/snapshots; lockf -ks -t 0 .buildlock ./docron

    The snapshots can be made available via rsyncd using a rsyncd.conf
    file similar to this:

uid = nobody
gid = nobody
use chroot = yes

[snapshots]
        path = /archive/snapshots

    Another machine can mirror the snapshots using something like this:

    lockf -ks -t 0 /root/adm/.rsynclock2 /usr/pkg/bin/rsync -aHS	\
	snapshotbox.domain::snapshots/ /archive/snapshots/