diff --git a/proxmox/backup.pve.content.sh b/proxmox/backup.pve.content.sh
index b200a98..13a7403 100755
--- a/proxmox/backup.pve.content.sh
+++ b/proxmox/backup.pve.content.sh
@@ -3,8 +3,11 @@
 # This script will backup /etc/pve content :
 #   1. Make an archive to a first directory (default: /etc/proxmox.pve/backup/).
 #   2. Hard link a fix archive name (pve.latest.tar.gz) to new archive
-#      Easy to monitor (this path can be expected).
-#   3. Clean backups older than retention time (default: 7).
+#      Easy to monitor (eg. this path can be expected).
+#   3. Limit permissions to backup directory (backup:adm).
+#   4. Clean backups older than retention time (default: 7).
+#   5. (optionnal) Copy backup to a second directory (nfs mountpoint, other hdd,…).
+#
 
 # This script can be call by a cronjob (eg. daily).
 
@@ -29,7 +32,7 @@ readonly COLOR_DEBUG="${PURPLE}"
 usage() {                                                       # {{{
 
 	cat <<- EOF
-usage: $PROGNAME [-d|-f|-h|-r]
+usage: $PROGNAME [-d|-f|-h|-r|-s]
 
 Backup /etc/pve content.
 
@@ -38,11 +41,14 @@ EXAMPLES :
         ${PROGNAME}
 
     - Backup /etc/pve content to /var/backups/pve directory
-        ${PROGNAME} --first /var/backups/pve
+        ${PROGNAME} --first-directory /var/backups/pve
 
     - Backup to default path and keep backups for 14 days
         ${PROGNAME} --retention 14
 
+    - Duplicate backups to a second directory (/mnt/nfs/pve)
+        ${PROGNAME} --second-directory /mnt/nfs/pve
+
 OPTIONS :
     -d,--debug
         Enable debug messages.
@@ -58,6 +64,9 @@ OPTIONS :
         Backups older than retention time (default: ${DEFAULT_RETENTION_TIME})
         will be delete.
 
+    -s,--second,--second-directory
+        Path to a second directory to duplicate backups (default: not set).
+
 	EOF
 
 }
@@ -124,10 +133,10 @@ main() {                                                        # {{{
 		&& printf '%b\n' "${RED}/etc/pve directory doesn't seems available. Are you sure you run this script on a Proxmox host?${RESET}" \
 		&& exit 1
 	## }}}
-	## Verify if the local destination directory is absent {{{
+	## Verify if the first destination directory is absent {{{
 	### AND create it
 	is_directory_absent "${first_bkp_dir}" \
-		&& mkdir -p -- ${first_bkp_dir}
+		&& mkdir -p -- "${first_bkp_dir}"
 	## }}}
 
 	## Create an archive of /etc/pve to $first_bkp_dir {{{
@@ -151,6 +160,20 @@ main() {                                                        # {{{
 		|| exit 4
 	## }}}
 
+	## If second directory is defined  {{{
+	if [ -n "${second_bkp_dir}" ]; then
+		### Verify if the second destination directory is absent {{{
+		#### AND create it
+		is_directory_absent "${second_bkp_dir}" \
+			&& mkdir -p -- "${second_bkp_dir}"
+		### }}}
+		### Synchronize first directory to second {{{
+		#### OR exit with error code 12 if it fails
+		rsync -a -- "${first_bkp_dir}/" "${second_bkp_dir}/" \
+			|| exit 12
+		### }}}
+	fi
+	## }}}
 }
 # }}}
 
@@ -179,7 +202,7 @@ if [ ! "${NBARGS}" -eq "0" ]; then
 		-d|--debug )                          ## debug
 			DEBUG=0
 			;;
-		-f|--first,--first-directory )        ## first directory to store backup
+		-f|--first|--first-directory )        ## first directory to store backup
 			## Move to the next argument
 			shift
 			## Define first_bkp_dir
@@ -196,6 +219,12 @@ if [ ! "${NBARGS}" -eq "0" ]; then
 			## Define retention_time
 			retention_time="${1}"
 			;;
+		-s|--second|--second-directory )      ## second directory to duplicate backup
+			## Move to the next argument
+			shift
+			## Define second_bkp_dir
+			second_bkp_dir="${1}"
+			;;
 		* )                                   ## unknow option
 			printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
 			printf '%b\n' "---"