backup-script.sh

#!/bin/bash


# Usage instructions at http://www.megaleecher.net/Best_Raspberry_Pi_Hot_Backup_Shell_Script
# This version disables backup image compression as it takes too much time on Pi, to enable uncomment the relavent lines
# Setting up directories, Just change SUBDIR and DIR varibales below to get going


SUBDIR=raspberrypi-backups
DIR=/media/usb/$SUBDIR
echo "Starting RaspberryPI backup process!"

# First check if pv package is installed, if not, install it first
PACKAGESTATUS=`dpkg -s pv | grep Status`;

if [[ $PACKAGESTATUS == S* ]]
   then
      echo "Package 'pv' is installed."
   else
      echo "Package 'pv' is NOT installed."
      echo "Installing package 'pv'. Please wait..."
      apt-get -y install pv
fi

# Check if backup directory exists
if [ ! -d "$DIR" ];
   then
       echo "Backup directory $DIR doesn't exist, creating it now!"
       mkdir $DIR
fi

# Create a filename with datestamp for our current backup (without .img suffix)
OFILE="$DIR/backup_$(date +%Y%m%d_%H%M%S)"

# Create final filename, with suffix
OFILEFINAL=$OFILE.img

# First sync disks
sync; sync

# Shut down some services before starting backup process
echo "Stopping some services before backup."
service apache2 stop
service mysql stop
service cron stop
service docker stop

# Begin the backup process, should take about 1 hour from 8Gb SD card to HDD
echo "Backing up SD card to USB HDD."
echo "This will take some time depending on your SD card size and read performance. Please wait..."
SDSIZE=`blockdev --getsize64 /dev/mmcblk0`;
pv -tpreb /dev/mmcblk0 -s $SDSIZE | dd of=$OFILE bs=1M conv=sync,noerror iflag=fullblock

# Wait for DD to finish and catch result
RESULT=$?

# Start services again that where shutdown before backup process
echo "Start the stopped services again."
service apache2 start
service mysql start
service cron start
service docker start

# If command has completed successfully, delete previous backups and exit
if [ $RESULT = 0 ];
    then
       echo "Successful backup, previous backup files will be deleted."
       # rm -f $DIR/backup_*.tar.gz
       rm -f $DIR/backup_*.img
       mv $OFILE $OFILEFINAL
       echo "Tarring is not enabled, due to pi performance"
       # echo "Backup is being tarred. Please wait..."
       #tar zcf $OFILEFINAL.tar.gz $OFILEFINAL
       # rm -rf $OFILEFINAL
       echo "RaspberryPI backup process completed! FILE: $OFILEFINAL"
       exit 0
    # Else remove attempted backup file
    else
       echo "Backup failed! Previous backup files untouched."
       echo "Please check there is sufficient space on the HDD."
       rm -f $OFILE
       echo "RaspberryPI backup process failed!"
       exit 1
fi