Backup and restore Android partitions to SD Card

android_backup_restore.sh

#!/bin/sh

#open adb shell
adb shell

#listing partitions (general command for Android devices)
#ls -l /dev/block/platform/<block_device_name>/by-name/

#for the ZTE Axon7
ls -l /dev/block/platform/soc/624000.ufshc/by-name/

# handles file size limit on e.g. FAT partitions with blit

#backup via ADB
adb shell 'dd if=/dev/block/platform/soc/624000.ufshc/by-name/boot' | gzip -c | split -b 2000m - /path/to/backup/on/localmachine/boot.gz.
adb shell 'dd if=/dev/block/platform/soc/624000.ufshc/by-name/userdata' | gzip -c | split -b 2000m - /path/to/backup/on/localmachine/userdata.gz.
adb shell 'dd if=/dev/block/platform/soc/624000.ufshc/by-name/system' | gzip -c | split -b 2000m - /path/to/backup/on/localmachine/system.gz.
# No idea if it possible to reinject them, but save ....
adb shell 'su -c dd if=/dev/block/platform/soc/624000.ufshc/by-name/cryptkey' > /path/to/backup/on/localmachine/cryptkey.dd
adb shell 'su -c dd if=/dev/block/platform/soc/624000.ufshc/by-name/keystore' > /path/to/backup/on/localmachine/keystore.dd
adb shell 'su -c dd if=/dev/block/platform/soc/624000.ufshc/by-name/keymaster' > /path/to/backup/on/localmachine/keymaster.dd

#restore: cat | adb shell does not work properly (it doesnt find end of stream)
#This example is only userdata
adb forward tcp:9999 tcp:6666
adb forward --list # you should see port 9999 listening in localhost
adb shell 'nc -l -p 6666 > /dev/block/platform/soc/624000.ufshc/by-name/userdata'
cat /path/to/backup/on/localmachine/userdata.gz.* | gzip -dc | nc 127.0.0.1 9999

# To follow the progress on your local machine, open a new shell and ...
sudo apt install progress
progress -m
# Recovery speed is about 3.0 MiB/s remaining ...loooong.... that's about 5 min per GB, the Axon das 56GB userdata .... ZzZzzZzzzZ ...