Upgrade NetBSD from binary sets
Get all the sets from a handy mirror, then:
Perform a minimal safety backup
$ tar zcvf etc-backup.tar.gz /etc
$ cp /netbsd /netbsd.old
Upgrade the system
$ tar zxvpf kern-GENERIC.tgz -C /
$ tar zxvpf base.tgz -C /
$ tar zxvpf comp.tgz -C /
$ tar zxvpf man.tgz -C /
$ tar zxvpf text.tgz -C /
$ tar zxvpf games.tgz -C /
Upgrade configuration files
$ mkdir /tmp/tmproot
$ tar zxvpf etc.tgz -C /tmp/tmproot
$ etcupdate -s /tmp/tmproot/etc
