RPI Backup

system_backup.sh

#!/bin/bash
#
# Automate Raspberry Pi Backups
# Inspired from https://raw.githubusercontent.com/kallsbo/BASH-RaspberryPI-System-Backup/master/system_backup.sh
# Kristofer Källsbo 2017 www.hackviking.com
#
# Usage: system_backup.sh {path} {days of retention}
#
# Below you can set the default values if no command line args are sent.
# The script will name the backup files {$HOSTNAME}.{YYYYmmdd}.img
# When the script deletes backups older then the specified retention
# it will only delete files with it's own $HOSTNAME.
#

# Declare vars and set standard values
backup_path=/mnt/backup/
retention_days=3

# Check that we are root!
if [[ ! $(whoami) =~ "root" ]]; then
echo ""
echo "**********************************"
echo "*** This needs to run as root! ***"
echo "**********************************"
echo ""
exit
fi

# Check to see if we got command line args
if [ ! -z $1 ]; then
   backup_path=$1
fi

if [ ! -z $2 ]; then
   retention_days=$2
fi

# Create trigger to force file system consistency check if image is restored
touch /boot/forcefsck

# Perform backup
dd if=/dev/mmcblk0 of=$backup_path/$HOSTNAME.$(date +%Y%m%d).img bs=1M

# Remove fsck trigger
rm /boot/forcefsck

# Delete old backups
find $backup_path/$HOSTNAME.*.img -mtime +$retention_days -type f -delete 

Configuration

0. Install nfscommon

sudo apt-get update

sudo apt-get install nfs-common

1. Create mounting dir

mkdir /mnt/backup

2. Setup NFS, create backup dir on NAS then create fstab parameters
   Nom d'hôte ou ip: ip du client (rpi) 192.168.1.10
   Privilège: lecture/écriture
   Squash: mappage de tous les utilisateurs
   Sécurité: sys
   Cocher: activer le mode asucnhrone, permettre la connexion à partir des portsnnon priviléiés, permettre à des utilisateurs d'accéder aux sous dossier, etc

sudo nano /etc/fstab

Vérifier
192.168.1.xxx:/volume1/8_BackUPs/rpi /mnt/backup nfs rsize=8192,wsize=8192,timeo=14,intr 0 0

3. Test the mount

sudo mount -a

4. Place the script in the shared rpi dir

chmod +x system_backup.sh

5. Add it to crontab

sudo crontab -e

0 3 * * * /mnt/backup/system_backup.sh