====  Backup Android Apps data and system apps ====

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Create the backup (**whole**)
<code bash>
adb backup -apk -noshared -all -system -f ./my-backup.ab
</code>

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Create a **Single-Package** backup
<code bash>
# list the package names
adb shell pm list packages

# Create a WhatsApp backup (for example), where PACKAGE-NAME is "com.whatsapp"
adb backup -f yourbackupfile.ab -noapk com.whatsapp
</code>

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**Extract** the files/directories of the backup for **query or modification**
<code bash>
# strip the first 24 bytes (header) and decompress the raw zlib data with "openssl"
dd if=yourbackupfile.ab ibs=24 skip=1 | openssl zlib -d > yourbackupfile.tar
# in case you don't have zlib support on your openssl, you can do this:
dd if=yourbackupfile.ab bs=1 skip=24 | python3 -c 'import zlib,sys;sys.stdout.write(zlib.decompress(sys.stdin.read()))' > yourbackupfile.tar

# extract the archive
tar xvf yourbackupfile.tar
</code>

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More informatión of **how to modify/repack** and restore an Android ADB Backup on:
https://stackpointer.io/mobile/android-adb-backup-extract-restore-repack/372/

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Restore the backup (any)
<code bash>
adb restore ./my-backup.ab
</code>