[Bash/Backup] backup the entire linux system to image

BackupLinuxImage.sh

# backup linux image
# DSK='disk4'   # manual set disk
OUTDIR=./$1/snapshots/
mkdir -p OUTDIR
# Find disk with Linux partition
## Note: This also works with Raspbian
export DSK=`diskutil list | awk '/Linux/ {print $5}' | cut -c 1-5 | uniq`
if [ $DSK ]; then
    echo $DSK
    echo $OUTDIR
else
    echo "Disk not found"
    exit
fi

diskutil unmountDisk /dev/$DSK
echo please wait - This takes some time
echo Ctl+T to show progress!
echo $DSK
time sudo dd if=/dev/r$DSK bs=4m | gzip -9 > $OUTDIR/temp.img.gz
#rename to current date
echo compressing completed - now renaming
mv -n $OUTDIR/temp.img.gz $OUTDIR/latest.img.gz