Identify the tape device

dmesg | grep st

Check the status of the tape drive

mt -f /dev/rmt/0 status

Tarring files to a tape

tar cvf /dev/rmt/0 *

Cpioing files to a tape

find . -print | cpio -ovcB > /dev/rmt/0

Viewing cpio files on a tape

cpio -ivtB < /dev/rmt/0

Restoring a cpio

cpio -ivcB < /dev/rmt/0

To compress a file

compress -v some.file

To uncompress a file

uncompress some.file.Z

To encode a file

uuencode some.file.Z some.file.Z

To unencode a file

uudecode some.file.Z some.file.Z

To dump a disk slice using ufsdump

ufsdump 0cvf /dev/rmt/0 /dev/rdsk/c0t0d0s0
or
ufsdump 0cvf /dev/rmt/0 /export/home

To restore a dump with ufsrestore

ufsrestore rvf /dev/rmt/0

To duplicate a disk slice directly

ufsdump 0f - /dev/rdsk/c0t0d0s7 |(cd /home;ufsrestore xf -)