Code for a backup image

#!/bin/bash

# Mounted SSD
# Use your mounted device

DEVICE_NAME=/dev/sda1

# Device folder name

FOLDER_NAME=RPi3_Backup_image

# Get the current day of the month

current_day=$(date +%-d)

# Get the current month

current_month=$(date +%-m)

# Check if the current day is the first day of the month and if the current month is a multiple of 3

if [ $current_day -eq 1 ] && [ $((current_month % 3)) -eq 0 ]; then

# Image name

IMAGE_NAME=bullsey_$(date +%Y%m%d).img

# Check if the SSD is mounted

if mount | grep $DEVICE_NAME > /dev/null; then

echo "Device is already mounted"

else

echo "Error: Device is not mounted at $DEVICE_NAME"

exit 1

fi

# Check if the image file already exists in the destination folder

if [ -f $DEVICE_NAME/$FOLDER_NAME/$IMAGE_NAME ]; then

echo "Image file already exists in destination folder. Do you want to overwrite it? (y/n)"

read -r choice

if [ "$choice" != "y" ]; then

echo "Exiting script"

exit 1

fi

fi

# Create full image of Raspberry Pi3 bullseye

echo "Creating image file, please wait..."

start=$(date +%s)

# Exclude the SSD partition from the image file

sudo dd if=/dev/mmcblk0 bs=1M | pv -s $(blockdev --getsize64 /dev/mmcblk0) | dd of=$DEVICE_NAME/$FOLDER_NAME/$IMAGE_NAME bs=1M conv=notrunc,noerror iflag=fullblock oflag=direct

end=$(date +%s)

echo "Image creation completed in $((end-start)) seconds"

else

echo "Current day is not the first day of the month or current month is not a multiple of 3. Skipping image creation."

fi