Back Up Headless Raspberry Pi Zero with RPI-Clone or PiShrink

pi-microsd-usb.jpg

Learn how to make a back-up or clone an installation of Raspbian Stretch Lite using RPI-Clone or DD with PiShrink.

If you are running Raspbian Stretch Lite and want to make a backup of your microSD card here are two options for this. First cloning the microSD card onto another microSD card and second, making an .img file that can be used to create a new bootable installation later.

Cloning the microSD Card

If you want to clone your existing installation to another microSD card then RPI-Clone https://github.com/billw2/rpi-clone seems to work the best.

Run the following commands to install rpi-clone:

git clone https://github.com/billw2/rpi-clone.git 
cd rpi-clone
sudo cp rpi-clone rpi-clone-setup /usr/local/sbin

Run a quick test with:

sudo rpi-clone-setup -t testhostname

To clone the current running installation to another microSD card card plugged into an card adapter on the USB port:

rpi-clone sda

You should then be able to power down the Pi and swap the two cards and then power up with the cloned installation. See the Github page above for more example commands.

Making an img File

You can use the Linux dd command to copy the current running installation to an .img file on a removable USB device plugged into the USB port. You can save this somewhere and use it with Etcher to make another bootable microSD card in the future. Take care that you are copying to the correct device. The following commands will create this:

To check the partitions are what you are expecting:

lsblk

Create the directory for mounting:

sudo mkdir /media/usb
sudo chmod 775 /media/usb

Mount the USB connected device.  A single partition Fat32 USB stick on sdb1 in this case:

sudo mount -t vfat /dev/sdb1 /media/usb -o rw,umask=0000

Make an img file from the card inserted in the Pi microSD card slot. Will take some time:

sudo dd if=/dev/mmcblk0 of=/media/usb/imgfile.img bs=1M

This is how it looks on my system:

Pi Zero Back Up Using DD command

You can then use another script called PiShrink (https://github.com/Drewsif/PiShrink) to reduce the size of the .img file. PiShrink also has the advantage that it sets up the img so the new installation automatically resizes to fill the microSD card the first time it boots.

To install PiShrink:

wget https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh
chmod +x pishrink.sh
sudo mv pishrink.sh /usr/local/bin

Usage:

sudo pishrink.sh /media/usb/imgfile.img /media/usb/shrunkimgfile.img

PiShrink in the Shell

When it’s complete you can un-mount the USB device with sudo umount /dev/sdb1 and remove the USB device.

umount

You can then copy the new shrunk file  somewhere for safe keeping. Here’s the two files on my Windows PC

Original and Shrunk img

I used Etcher to flash a 16GB  card using the shrunkimgfile.img. The original 4GB card image that I copied from has grown to fit the 16GB card when the Pi booted for the first time.

PiShrink Grown to Fit

Note: I found that sometimes I would get errors with PiShrink writing to a microSD card in a USB reader. When I tried with a USB stick it worked better.

Here’s some useful commands that might help if you have problems with cloning or backing up your Pi Zero – https://www.binarytides.com/linux-command-check-disk-partitions/

Full Raspbian with Desktop

If you are running the full version of Raspbian then there’s a built in tool you can use to make a copy of your installation. On the menu Accessories > SD Card Copier

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