rsync backup - incremental backup script

#!/bin/bash

###############################################################################
### Release notes
###############################################################################
# Title:          	rsync incremental backup script (LOCAL)
# version:        	2008-07-27
# License:        	GnuGPL v2
#
# Description:    	The script is used to make LOCAL incremental backups of one
#                 	directory. Note, in this version only LOCAL2LOCAL is supported!
#
# Author:         	Per Lasse Baasch (c)
# Website:        	http://www.skycube.net
#
# Requirements:   	rsync
#
# Sample Usage:	    ./rsync_backup_v2.sh /home/sampleuser /media/usbbackup/backup
#
# ToDo:             - Remote RUN
#                   - LifeTime (Timeout where old backups automaticly will be deleted)
#                   - Exclude files and folders
#					
###############################################################################
### Configuration
###############################################################################

# Source directory MUST ALLREADY EXIST
DIRA="$1"

# Destination directory MUST ALLREADY EXIST
DIRB="$2"

###############################################################################
### Don't change anything below this line if you don't have errors!
###############################################################################

# Path to rsync
RSYNC=/usr/bin/rsync

# File for the logs
LOGFILE="rsynctransfer.log"

# File to save name of last backup
CURRENTSTATEFILE="currentstate.txt"

# START the timer
TIMER1=`date +%s`

# Check if the currentstate exist else, create it
TESTCURRENTFILE=`ls $DIRB/ | grep $CURRENTSTATEFILE`
if [ "$TESTCURRENTFILE" != "$CURRENTSTATEFILE" ] 
then 
 tty=`echo empty > $DIRB/$CURRENTSTATEFILE`
 mkdir $DIRB/empty
 tty=`echo nolog > $DIRB/empty/$LOGFILE`
fi

# Get the old backup directory
OLDBACKUPDIR=`cat $DIRB/$CURRENTSTATEFILE`

# Set the new backup directory
NEWBACKUPDIR=`date +%F_%H-%M-%S`

# Temporary directory on destination
TMP=$DIRB/TMP

# rsync options
# -o               // preserve owner (root only)
# -g               // preserve group
# -p               // preserve permissions
# -t               // preserve times
# -r               // recurse into directories
# -l               // copy symlinks as symlinks
# -c               // always checksum
# -v               // increase verbosity
# --delete         // delete files that don't exist on sender
# --force          // force deletion of dirs even if not empty
# --backup         // make backups
# --backup-dir     // make backups into this directory
# --ignore-errors  // delete even if there are I/O errors
OPTIONS="-ogptrlcv
         --delete 
         --force
         --backup
         --backup-dir=$TMP
         --ignore-errors"
#         --exclude=vms/"

# Create TMP directory for deleted files
mkdir $TMP

# Create new logfile
tty=`echo Start of rsynctransfer logfile > $DIRB/$LOGFILE`
# Execute the rsync
# sync the old backup state with the new state
# and backup deleted files to the TMP directory
tty=`echo -------------------------------------------- >> $DIRB/$LOGFILE`
tty=`echo STARTING BACKUP WITH THE NAME $NEWBACKUPDIR >> $DIRB/$LOGFILE`
$RSYNC $OPTIONS $DIRA $DIRB/$OLDBACKUPDIR >> $DIRB/$LOGFILE
tty=`echo END OF BACKUP WITH THE NAME $NEWBACKUPDIR >> $DIRB/$LOGFILE`

# Rename old backup directory to new backup directory
mv $DIRB/$OLDBACKUPDIR $DIRB/$NEWBACKUPDIR

# Rename TMP directory to oldbackup
mv $TMP $DIRB/$OLDBACKUPDIR

# Move logfiles to the correct directories
mv $DIRB/$NEWBACKUPDIR/$LOGFILE $DIRB/$OLDBACKUPDIR/
mv $DIRB/$LOGFILE $DIRB/$NEWBACKUPDIR/


# Write file with the name of current state
tty=`echo $NEWBACKUPDIR > $DIRB/$CURRENTSTATEFILE`

# Delete the directory "empty" after FIRST run
EMPTY=`ls $DIRB/ | grep empty`
if [ "$EMPTY" = "empty" ] 
then 
 rm -fr $DIRB/empty
fi

# STOP the timer
TIMER2=`date +%s`
# Calculate timer result
let TIMER=$TIMER2-$TIMER1
# Get human readable result, print it and save it to the log
HOURS='0'
MINUTES='0'

while [ $TIMER -gt 59 ]; do
 if [ $TIMER -ge 3600 ]; then
  let HOURS=HOURS+1; let TIMER=TIMER-3600;
 else
  let MINUTES=MINUTES+1; let TIMER=TIMER-60;
 fi
done
TIMERRESULT="DURATION OF BACKUP: $HOURS hours $MINUTES minutes $TIMER seconds"
echo $TIMERRESULT
tty=`echo $TIMERRESULT >> $DIRB/$NEWBACKUPDIR/$LOGFILE`