my rsyncbackup script

rsyncbackup.sh

#!/bin/bash
# Time-stamp: <2012-09-30 05:41:04 tamara>
#
# rsyncbackup - use rsync to make a backup
#
# Author: Tamara Temple <[email protected]>
# Created: 2012-06-01
# Copyright (c) 2012 Tamara Temple
# License: GPLv3
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
# 

# Following advice given on http://www.sanitarium.net/golug/rsync_backups_2010.html, make a periodic backup of device

# Backups are done using hard-linking, so that only the changes actually
# are written to the new directory, thus saving space. If files are 
# removed or moved from the source, they are appropriately reflected
# in the new backup.

RSYNC=$(which rsync)
MV=$(which mv)

while getopts 'dvs:t:e:o:' Option
do
    case $Option in
	'd' )
	    # DRY_RUN
	    DRY_RUN='--dry-run'
	    ;;
	'v' )
	    # VERBOSE
	    VERBOSE='--verbose --progress --itemize-changes'
	    ;;
	's' )
	    # SOURCE
	    SOURCE=$OPTARG
	    ;;
	't' )
	    # TARGET
	    TARGET=$OPTARG
	    ;;
	'e' )
	    # EXCLUDE FILE
	    EXCLUDE=$OPTARG
	    ;;
	'o' )
	    # extra options
	    EXTRAOPTS=$OPTARG
	    ;;
    esac
done

# Defaults if not yet defined
DRY_RUN=${DRY_RUN:-''}
VERBOSE=${VERBOSE:-''}
SOURCE=${SOURCE:-''}
TARGET=${TARGET:-''}
EXTRAOPTS=${EXTRAOPTS:-''}
EXCLUDE=${EXCLUDE:-'/etc/local/rsyncbackup.excludes'}
if [[ ! -z "$EXCLUDE" ]] ; then
    EXCLUDE="--exclude-from=$EXCLUDE"
fi
# SOURCE and TARGET *must* be given on command line
if [[ -z "$SOURCE" ]] ; then
    echo "SOURCE must be given on command line: -s SOURCE"
    exit -2
fi
if [[ -z "$TARGET" ]] ; then
    echo "TARGET must be given on command line: -t TARGET"
    exit -3
fi


# Check to see if there has been a previous backup by checking the .lastfull file in the target directory
# If so, assign the contents of the .lastfull file
# If not, assign null

[ -e "$TARGET/.lastfull" ] && LINKDEST="--link-dest=$(cat "$TARGET/.lastfull")" || LINKDEST=""

if [[ ! -z "$VERBOSE" ]] ; then
    set -vx
    echo DRY_RUN=$DRY_RUN
    echo SOURCE=$SOURCE
    echo TARGET=$TARGET
    echo LINKDEST=$LINKDEST
    echo EXCLUDE=$EXCLUDE
    echo EXTRAOPTS=$EXTRAOPTS
fi

if [[ -d "$TARGET/.incomplete" ]]
then
    mv "$TARGET/.incomplete" "$TARGET/.incomplete.$(date "+%FT%H-%M-%S")"
fi

echo "Backing up $SOURCE to $TARGET"

OPTS=" \
    $VERBOSE \
    $DRY_RUN \
    --archive \
    --one-file-system \
    --hard-links \
    --human-readable \
    --inplace \
    --numeric-ids \
    --delete \
    ${LINKDEST} ${EXCLUDE} ${EXTRAOPTS} \
    ${SOURCE} ${TARGET}/.incomplete"

if [[ ! -z "$VERBOSE" ]] ; then
    echo Rsync options: $OPTS
fi

$RSYNC $OPTS

if [[ ! $? ]]
    then
    echo 'rsync failed';
    exit $?
fi

if [[ -d "$TARGET/.incomplete" ]]
    then
    NEW_DIR=$(date "+%FT%H-%M-%S")
    $MV "$TARGET/.incomplete" "$TARGET/$NEW_DIR"
    echo "$TARGET/$NEW_DIR" > "$TARGET/.lastfull"
fi

echo "Backup complete."