Automated RaspberryPi image backup into a backup.img.gzip

backup.sh

!/bin/bash
# Backup OS to the USB Hard Disk Drive

# Create a filename with timestamp for our current backup (without .img suffix)
ofile="/data/Backups/$(date +%Y-%m-%yT%T)"

# Create final filename, with suffix
ofilefinal=$ofile.img.gz

# Begin the backup process, should take about 1 hour from 8Gb SD card to HDD
sudo dd if="/dev/mmcblk0" bs=1M | gzip > $ofile

# Collect result of backup procedure
result=$?

# If command has completed successfully, delete previous backups and exit
if [ $result=0 ]; then
    find /data/Backups/* -mtime +30 -exec rm {} \;
    mv $ofile $ofilefinal;
   exit 0;
fi

#If command has failed, then delete partial backup file
if [ $result=1 ]; then rm -f $ofile; exit 1;fi