diff --git a/README.md b/README.md
index 7bc5d2a..1671a0f 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,10 @@
-## Some GNU/Linux tools, for fun...
+### Some GNU/Linux tools, for fun...
 
-### bash
+#### bash
 
 - **trans.sh**: a [linguee.com](https://linguee.com) based command-line translator.
 
 - **sync.sh**: a rsync/ssh backup tool.
     - **sync-conf-example.sh**: configuration example.
+
+- **dup-live-disk.sh**: copy live partitions to backup disk.
diff --git a/bash/dup-live-disk.sh b/bash/dup-live-disk.sh
new file mode 100644
index 0000000..7cc9dd9
--- /dev/null
+++ b/bash/dup-live-disk.sh
@@ -0,0 +1,73 @@
+#!/bin/bash
+#
+# dup-live-disk.sh - duplicate live system partitions on new disk.
+#
+# (C) Bruno Raoult ("br"), 2007-2021
+# Licensed under the Mozilla Public License (MPL) version 2.0.
+# Some rights reserved. See COPYING.
+#
+# You should have received a copy of the Mozilla Public License along with this
+# program.  If not, see <https://www.mozilla.org/en-US/MPL>
+#
+# SPDX-License-Identifier: MPL-2.0 <https://spdx.org/licenses/MPL-2.0.html>
+#
+# This script will not work for all situations, I strongly suggest you
+# don't use it if you don't *fully* understand it.
+
+# dest device (used for grub)
+DSTDISK=/dev/sdb
+
+# partitions suffixes, for source and destination partitions.
+# For example, if we want to copy XX partition, source partition will be
+# /mnt/XX${SRCNUM}, and destination will be /mnt/XX${DSTNUM}
+SRCNUM=2
+DSTNUM=1
+
+# array of partitions to copy
+TO_COPY=(root export EFI)
+
+# An alternative to SRCNUM, DSTNUM, and TO_COPY variables would be to have
+# an array containing src and destination partitions:
+#   (partsrc1 partdst1 partsrc2 partdst2 etc...)
+# example:
+# TO_COPY=(root2 root1 export2 export1)
+# declare -i i
+# for ((i=0; i<${#TO_COPY[@]}; i+=2)); do
+#     SRC=${#TO_COPY[$i]}
+#     DST=${#TO_COPY[$i + 1]}
+# etc...
+
+# where we will configure/install grub: mount point, device
+GRUB_ROOT=/mnt/root${DSTNUM}
+GRUB_DEV=/dev/$(lsblk -no pkname /dev/disk/by-label/root${DSTNUM})
+
+# we will use ".rsync-disk-copy" files to exclude files/dirs
+RSYNCOPTS="-axH --delete --delete-excluded"
+FILTER=--filter="dir-merge .rsync-disk-copy"
+
+# stop what could be problematic (databases, etc...)
+systemctl stop mysql
+
+# partitions copy
+for part in ${TO_COPY[@]}; do
+    SRCPART=/mnt/${part}${SRCNUM}/
+    DSTPART=/mnt/${part}${DSTNUM}
+
+    echo copy from $SRCPART to $DSTPART
+    echo -n "press a key to continue..."
+    read -r key
+    echo rsync ${RSYNCOPTS} "$FILTER" "$SRCPART" "$DSTPART"
+    rsync ${RSYNCOPTS} "$FILTER" "$SRCPART" "$DSTPART"
+done
+
+# grub install
+# mount virtual devices
+mount -o bind  /sys    ${GRUB_ROOT}/sys
+mount -o bind  /proc   ${GRUB_ROOT}/proc
+mount -o bind  /dev    ${GRUB_ROOT}/dev
+
+chroot ${GRUB_ROOT} update-grub
+chroot ${GRUB_ROOT} grub-install ${GRUB_DEV}
+
+# restart stopped process (db, etc...)
+systemctl start mysql