Auto Generating Backup Files for your Linux Server

#!/bin/bash
##
# ./backup-files SOURCE DESTINATION
# (2) PARAMETERS required, destination where to save
# backup files and target files to backup
# .log File is in destination folder
#
# Pre-requisite: tar, tee, head, xargs, gzip
#
# Make it executable
# chmod u+x ./backup-files.sh
#
##
START=$(date +%s)
LOGS=$(date '+%m-%d-%Y %H:%M:%S')
if [ -z "$1" ] || [ -z "$2" ]; then
    LOGS+=" - ERROR: (2) PARAMS required"
        echo $LOGS
        echo "usage:"
        echo "./backup-files.sh SOURCE_FOLDER DESTINATION_FOLDER"
        echo "SOURCE_FOLDER - file source to be added in the archive"
        echo "DESTINATION_FOLDER - file destination to where the archive.tar.gz is saved"
        echo "e.g."
        echo "./backup-files.sh /home/username/public_hmtl /home/username/backup"
        exit 255;
fi

#PARAMS
DEBUG=false #Bolean
KEEP_FILES=5 #Only keep 5 recent files; 0 to disable
SOURCE_FOLDER=$1 # SOURCE_FOLDER="backup-source backup-another-source" #the folder that contains the files that we want to backup
BACKUP_FOLDER=$2
CWD=$(pwd) # assigning Current Working Directory (CWD)
#Database Exports
# Note: No whitespace in the -p Flag
# Warining: Careful of hard coded credentials
#mysqldump -u username -p'SecurePassword' DatabaseName | gzip > /home/username/www/public/backup/DatabaseName_`date +\%m-\%d-\%Y_\%H:\%M`.sql.gz

# Preinstalls --> For testing purpose only; delete this
if [[ "${DEBUG}" == "true" ]]; then
    echo "---START Preinstall----"
    mkdir -p $SOURCE_FOLDER && cd $SOURCE_FOLDER #
    SOURCE_FOLDER=$(pwd) # Re-assigning to absolute path
    mkdir -p new-folder
    echo "This is file 1" | tee -a ./file1.txt >/dev/null 2>&1
    echo "<h2>This is file 2</h2>" | tee -a ./file2.html >/dev/null 2>&1
    echo "<h3>This is file 3</h3>" | tee -a ./new-folder/file3.htm >/dev/null 2>&1
    pwd && ls
    echo -e "---END Preinstall---- \r\n"
fi
## End of preinstall --> delete until here.

# Check if Source Folder is not empty
if [ ! -d $SOURCE_FOLDER ] || [ -z "$(ls -A $SOURCE_FOLDER)" ]; then
    echo "error: SOURCE FOLDER is empty"
    exit 255;
fi

# The following is path correction for supposedly accuracy
cd $SOURCE_FOLDER && SOURCE_FOLDER=$(pwd) # Re-assigning to absolute path
cd $CWD && mkdir -p $BACKUP_FOLDER # Create backup folder if not available
cd $BACKUP_FOLDER && BACKUP_FOLDER=$(pwd) # Re-assigning to absolute path

FOLDERNAME="" # we don't know yet
TRIMPATH="[^\/]+$" # capture the backup folder name only
# Trim function
if [[ $BACKUP_FOLDER =~ $TRIMPATH ]]; then FOLDERNAME=${BASH_REMATCH[0]}
fi

BACKUPDATE=`date +%b-%d-%Y` #get the current date #replace this path
BACKUP_FILE=$BACKUP_FOLDER/backup-$BACKUPDATE.tar.gz

# Remove older backups first
# Check if file if exists
if [ $KEEP_FILES != 0 ] && [ -d $BACKUP_FOLDER ] && [ -n "$(ls -A $BACKUP_FOLDER)" ]; then
    # Only keep 5 recent backup files
    LOGS+="$(ls -tr $BACKUP_FOLDER/backup-*.tar.gz | head -n -$KEEP_FILES | xargs --no-run-if-empty rm)"
fi

# Avoid duplicate backup if exist
[ -f "$BACKUP_FILE" ] && rm $BACKUP_FILE

cd $SOURCE_FOLDER # Change Directory to avoid "tar: Removing leading `/' from member names" error
LOGS+="- Backup is running.. "
if [[ "${DEBUG}" == "true" ]]; then
    LOGS+="$(tar --exclude=*/$FOLDERNAME -zvcf $BACKUP_FILE .)" #create the backup, just add -v flag for verbose
else
    LOGS+="$(tar --exclude=*/$FOLDERNAME -zcf $BACKUP_FILE .)" # non-verbose
fi

END=$(date +%s)
DIFF=$(( $END - $START ))
LOGS+="It took $DIFF second to backups."

# Printing logs
echo -e $LOGS | tee -a $BACKUP_FOLDER/backup0.log >/dev/null 2>&1
echo $LOGS

# Debug results
if [[ "${DEBUG}" == "true" ]]; then
    echo "---Start Debug Extract---"
    cd $BACKUP_FOLDER && pwd && ls -lah
    tar -xvf backup-$BACKUPDATE.tar.gz >/dev/null 2>&1
    echo -e "\r-- Files from Extracted from backup-$BACKUPDATE.tar.gz --"
    pwd && ls -lah
    echo -e "\r-- Log File --"
    cat backup0.log
    echo "---End Debug Extract---"
fi
exit 0

chmod u+x ./backup-script.sh

crontab -e

0 1 * * 0 ~/public/backup-script.sh ~/public/Documents ~/public/Backup >> ~/public/cron.all.log 2>&1

./backup-script.sh ~/public/Documents ~/public/Backup