Backup Incremental (TAR)

#!/bin/bash
# full and incremental backup script
# created 07 February 2000
# Based on a script by Daniel O'Callaghan <[email protected]>
# and modified by Gerhard Mourani <[email protected]>
# and modified by Antonio Vanegas <[email protected]> @hpsaturn

#Change the 5 variables below to fit your computer/backup

COMPUTER=home                           # name of this computer
ROOT=/mnt/samba/bkp
DIRECTORIES=/home/xxx                   # directoris to backup
BACKUPDIR=$ROOT/$COMPUTER               # where to store the backups
TIMEDIR=$ROOT/$COMPUTER/last-full       # where to store time of full backup
TAR=/bin/tar                            # name and locaction of tar
IGNORE=$ROOT/$COMPUTER/ignorefiles      # list ignore

#You should not have to change anything below here

PATH=/usr/local/bin:/usr/bin:/bin
DOW=`date +%a`                      # Day of the week e.g. Mon
DOM=`date +%d`                      # Date of the Month e.g. 27
DM=`date +%d%b`                         # Date and Month e.g. 27Sep
DATE=`date +%Y%m%d`                     # Date format AAAAMMDD

# On the 1st of the month a permanet full backup is made
# Every Sunday a full backup is made - overwriting last Sundays backup
# The rest of the time an incremental backup is made. Each incremental
# backup overwrites last weeks incremental backup of the same name.
#
# if NEWER = "", then tar backs up all files in the directories
# otherwise it backs up files newer than the NEWER date. NEWER
# gets it date from the file written every Sunday.


# Monthly full backup
if [ $DOM = "14" ]; then
        NEWER=""
        $TAR $NEWER -zcf $BACKUPDIR/bkp_$COMPUTER_$DATE.tar.gz --exclude-from=$IGNORE $DIRECTORIES
fi

# Weekly full backup
if [ $DOW = "Fri" ]; then
        NEWER=""
        NOW=`date +%d-%b`

        # Update full backup date (/tmp for samba)
        echo $NOW > /tmp/$COMPUTER-full-date
        mv /tmp/$COMPUTER-full-date $TIMEDIR/
        # remove file if exist
        FILE=$BACKUPDIR/$COMPUTER-$DOW.tar.gz
        if [ -e $FILE ]; then
          rm $FILE
        fi
        $TAR $NEWER -zcf $FILE --exclude-from=$IGNORE $DIRECTORIES

# Make incremental backup - overwrite last weeks
else
        # Get date of last full backup
        NEWER="--newer `cat $TIMEDIR/$COMPUTER-full-date`"
        # remove file if exist
        FILE=$BACKUPDIR/$COMPUTER-$DOW.tar.gz
        if [ -e $FILE ]; then
          rm $FILE
        fi
        $TAR $NEWER -zcf $FILE --exclude-from=$IGNORE $DIRECTORIES
fi