Backup your partition on Android

dump.sh

#!/bin/sh

blockdir=/dev/block/bootdevice/by-name
output=/sdcard/Download/PartitionBackup
exclude="userdata,hoge"

if ! [ "$(whoami)" = root ]; then
    echo "Run as root" >&2
    exit 1
fi

mkdir -p "$output"


for file in "$blockdir/"*; do
    if echo "$exclude" | tr "," "\n" | grep -qx "$(basename "$file")"; then
        continue
    fi

    #fileはフルパス
    dd if="$file" of="${output}/$(basename "$file")"
done