Stop backup disk

#!/bin/bashecho Unmounting mediaumount /media/backupretval=$?if [ "$retval" != "0" ] ; then echo Unmounting media failed: $retval ; fiecho Stopping LUKS-encrypted volumecryptsetup luksClose backupretval=$?if [ "$retval" != "0" ] ; then echo Stopping volume failed: $retval ; fiecho Disassembling linear arraymdadm --stop /dev/md0retval=$?if [ "$retval" != "0" ] ; then echo Disassembling array failed: $retval ; fiecho Syncing diskssyncexit $retval