# mkdir cd /tmp/restore_etc
# cd /tmp/restore_etc
# mt -f /dev/rmt/0mn rew (rewind ignite tape)
# mt -f /dev/rmt/0mn fsf 1 (fast forward to right postion on tape)
# tar xvf /dev/rmt/0m etc (restore directory)

NO slash for "etc" -> not /etc

# cp -R -p -i . /etc/
Don't overwrite files by pressing the N key when asked

Another option
# tar xvf /dev/rmt/0m etc/aliases (restore single file)
NO slash for "etc"