A simple script to backup my Android phone to my Macbook.

backupAndroidDevice.sh

#!/bin/bash
#
# backupAndroidDevice.sh
#
# A simple script to backup my Android phone to my Macbook. 
#
# Syntax: backupAndroidDevice.sh output_folder
#    output folder must exist
#
# Requirements/assumptions:
# * Device is running in TWRP recovery
# * Device has an external SD card with sufficient space to back up /data/media/0 (internal SD card)
# * Device can respond to 'adb shell' commands
#
# Actions:
#     Creates a subfolder with the current data_time as the name.
# 

# sanitize command line
if [ $# -lt 1 ]
  then
    echo "Usage: $0 output_folder"
    exit 1
fi

# input folder exists
if [ ! -d "$1" ]; then
	echo "$1 does not exist"
    exit 1
fi

# Create name of output folder
dt=$(date '+%Y%m%d_%H%M%S');

# Check existence of output folder and create new folder
cd $1
if [ $? -ne 0 ]; then
    echo "Could not find $1"
    exit 1
fi

mkdir $dt
if [ $? -ne 0 ]; then
    echo "Could not create $dt"
    exit 1
fi

cd $dt
if [ $? -ne 0 ]; then
    echo "Could not find $dt"
    exit 1
fi

# Get ready
echo "Put your device into TWRP recovery and swipe to unlock."
echo "Ensure your device has an external SD card mounted, formatted as portable storage, with room to store archive."
read -n1 -r -p "Press space to continue..." key

ext="/external_sd/internal_backup"

# Test SD card backup dir
if [ ! -d "$ext" ]; then
	adb shell mkdir $ext
	if [ $? -ne 0 ]; then
	    echo "Could not create $ext"
	    exit 1
	fi
fi

# Remove dense cache folders. 
# NOTE: This will be different for everyone
echo "Deleting caches..."
adb shell rm -rf /data/media/0/Android/data/com.google.android.youtube/cache
adb shell rm -rf /data/media/0/Android/data/com.android.providers.media/albumthumbs/
adb shell rm -rf /data/media/0/Android/data/com.google.android.apps.maps/cache/
adb shell rm -rf /data/media/0/Android/data/com.dropbox.android/cache/
adb shell rm -rf /data/media/0/Android/data/com.dropbox.android/asset_cache/
adb shell rm -rf /data/media/0/Android/data/pl.solidexplorer2/cache/

# Backup partitions. 

echo "Backing up /boot..."
adb backup -f boot.ab --twrp --compress boot
if [ $? -ne 0 ]; then
    echo "Could not backup /boot"
    exit 1
fi

# I'm not 100% certain these adb reboots are necessary, but without them, I get 
# errors about multiple threads running.  It may be alright to just wait 20 secs
# rather than wait for user to press a key
adb reboot recovery
read -n1 -r -p "Press space when recovery is ready..." key


echo "Backing up /system..."
adb backup -f system.ab --twrp --compress system
if [ $? -ne 0 ]; then
    echo "Could not backup /system"
    exit 1
fi

adb reboot recovery
read -n1 -r -p "Press space when recovery is ready..." key

echo "Backing up /data..."
adb backup -f data.ab --twrp --compress data
if [ $? -ne 0 ]; then
    echo "Could not backup /data"
    exit 1
fi

echo "Backup up internal storage..."
adb shell tar czvpf /external_sd/internal_backup/media.tar.gz /data/media/0/
if [ $? -ne 0 ]; then
    echo "Could not backup /data/media/0"
    exit 1
fi

echo "Copy internal storage to computer..."
adb pull /external_sd/internal_backup/media.tar.gz
if [ $? -eq 0 ]; then
    adb shell rm /external_sd/internal_backup/media.tar.gz
else
    echo "Could not pull /external_sd/internal_backup/media.tar.gz from device. You can manually retrieve this file."
    exit 1
fi

exit 0