diff --git a/actions.json b/actions.json
new file mode 100644
index 0000000..862ff5d
--- /dev/null
+++ b/actions.json
@@ -0,0 +1,22 @@
+[{
+		"id": "reset_default_unattended",
+		"name": "Reset the 50unattended-upgrades config file and restore a default one.",
+		"command": "/bin/bash scripts/actions/reset_default_config \"50unattended-upgrades\"",
+		"user": "root",
+		"accepted_return_codes": [0],
+		"description": {
+			"en": "Reset the unattended-upgrades config file 50unattended-upgrades.",
+			"fr": "Réinitialise le fichier de configuration unattended-upgrades 50unattended-upgrades."
+		}
+},
+{
+		"id": "reset_default_periodic",
+		"name": "Reset the 02periodic apt config file and restore a default one.",
+		"command": "/bin/bash scripts/actions/reset_default_config \"02periodic\"",
+		"user": "root",
+		"accepted_return_codes": [0],
+		"description": {
+			"en": "Reset the config file 02periodic.",
+			"fr": "Réinitialise le fichier de configuration 02periodic."
+		}
+}]
diff --git a/config_panel.json b/config_panel.json
new file mode 100644
index 0000000..59334f7
--- /dev/null
+++ b/config_panel.json
@@ -0,0 +1,89 @@
+{
+	"name": "Unattended-upgrades configuration panel",
+	"version": "0.1",
+	"panel": [{
+		"name": "Unattended-upgrades configuration",
+		"id": "main",
+		"sections": [{
+			"name": "50unattended-upgrades configuration file",
+			"id": "unattended_configuration",
+			"options": [{
+				"name": "Choose the sources of packages to automatically upgrade.",
+				"help": "We can't use a choices field for now. In the meantime please choose between one of this values:<br>Security only, Security and updates.",
+				"id": "upgrade_level",
+				"type": "text",
+				"//": "\"choices\" : [\"Security only\", \"Security and updates\"]",
+				"default" : "Security only"
+			},
+			{
+				"name": "Would you like to update YunoHost packages automatically ?",
+				"id": "ynh_update",
+				"type": "bool",
+				"default": true
+			},
+			{
+				"name": "Would you like to receive an email from Unattended-Upgrades ?",
+				"help": "We can't use a choices field for now. In the meantime please choose between one of this values:<br>If an upgrade has been done, Only if there was an error, Never.",
+				"id": "unattended_mail",
+				"type": "text",
+				"//": "\"choices\" : [\"If an upgrade has been done\", \"Only if there was an error\", \"Never\"]",
+				"default" : "If an upgrade has been done"
+			}]
+		},
+		{
+			"name": "apticron cron file",
+			"id": "apticron_configuration",
+			"options": [{
+				"name": "Would you like to receive an email to inform which upgrades need to be done ?",
+				"id": "previous_apticron",
+				"type": "bool",
+				"default": true
+			},
+			{
+				"name": "When do you want to receive this email ?",
+				"help": "Choose an hour between 12 and 23.<br>",
+				"id": "previous_apticron_hour",
+				"type": "number",
+				"default": 20
+			},
+			{
+				"name": "Would you like to receive an email to verify if there any upgrades left after each auto upgrade ?",
+				"id": "after_apticron",
+				"type": "bool",
+				"default": true
+			},
+			{
+				"name": "When do you want to receive this email ?",
+				"help": "Choose an hour between 0 and 10.",
+				"id": "after_apticron_hour",
+				"type": "number",
+				"default": 2
+			}]
+		},
+		{
+			"name": "02periodic apt config file",
+			"id": "periodic_configuration",
+			"options": [{
+				"name": "Choose the level of verbosity of Unattended-Upgrades mail",
+				"help": "We can't use a choices field for now. In the meantime please choose between one of this values:<br>1, 2, 3.",
+				"help": "1: Progress report only.<br>2: Progress report and command outputs.<br>3: Progress report and command outputs and trace.",
+				"id": "unattended_verbosity",
+				"type": "text",
+				"//": "\"choices\" : [\"1\", \"2\", \"3\"]",
+				"default" : "1"
+			}]
+		},
+		{
+			"name": "Overwriting config files",
+			"id": "overwrite_files",
+			"options": [{
+				"name": "Overwrite the config file 02periodic ?",
+				"help": "If the file is overwritten, a backup will be created.",
+				"id": "overwrite_periodic",
+				"type": "bool",
+				"default": true
+			}]
+		}]
+	}
+]
+}
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 21234d0..8d58e36 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -30,6 +30,24 @@ IS_PACKAGE_CHECK () {
 	return $(env | grep -c container=lxc)
 }
 
+#=================================================
+# BOOLEAN CONVERTER
+#=================================================
+
+bool_to_01 () {
+	local var="$1"
+	[ "$var" = "true" ] && var=1
+	[ "$var" = "false" ] && var=0
+	echo "$var"
+}
+
+bool_to_true_false () {
+	local var="$1"
+	[ "$var" = "1" ] && var=true
+	[ "$var" = "0" ] && var=false
+	echo "$var"
+}
+
 #=================================================
 # EXPERIMENTAL HELPERS
 #=================================================
@@ -517,7 +535,7 @@ EOF
   ynh_store_file_checksum "$finalfail2banjailconf"
   ynh_store_file_checksum "$finalfail2banfilterconf"
 
-  systemctl reload fail2ban
+  systemctl restart fail2ban
   local fail2ban_error="$(journalctl -u fail2ban | tail -n50 | grep "WARNING.*$app.*")"
   if [ -n "$fail2ban_error" ]
   then
@@ -532,7 +550,7 @@ EOF
 ynh_remove_fail2ban_config () {
   ynh_secure_remove "/etc/fail2ban/jail.d/$app.conf"
   ynh_secure_remove "/etc/fail2ban/filter.d/$app.conf"
-  systemctl reload fail2ban
+  systemctl restart fail2ban
 }
 
 #=================================================
diff --git a/scripts/actions/reset_default_config b/scripts/actions/reset_default_config
new file mode 100755
index 0000000..f02bfe4
--- /dev/null
+++ b/scripts/actions/reset_default_config
@@ -0,0 +1,102 @@
+#!/bin/bash
+
+#=================================================
+# GENERIC STARTING
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+source scripts/_common.sh
+source /usr/share/yunohost/helpers
+
+#=================================================
+# RETRIEVE ARGUMENTS
+#=================================================
+
+app=${YNH_APP_INSTANCE_NAME:-$YNH_APP_ID}
+upgrade_level="$(ynh_app_setting_get $app upgrade_level)"
+ynh_update="$(ynh_app_setting_get $app ynh_update)"
+unattended_mail="$(ynh_app_setting_get $app unattended_mail)"
+unattended_verbosity="$(ynh_app_setting_get $app unattended_verbosity)"
+
+#=================================================
+# SORT OUT THE CONFIG FILE TO HANDLE
+#=================================================
+
+file="$1"
+
+if [ "$file" = "50unattended-upgrades" ]; then
+	config_file="/etc/apt/apt.conf.d/50unattended-upgrades"
+elif [ "$file" = "02periodic" ]; then
+	config_file="/etc/apt/apt.conf.d/02periodic"
+fi
+
+#=================================================
+# SPECIFIC ACTION
+#=================================================
+# RESET THE CONFIG FILE
+#=================================================
+
+# Verify the checksum and backup the file if it's different
+ynh_backup_if_checksum_is_different "$config_file"
+
+if [ "$file" = "50unattended-upgrades" ]
+then
+	# Get the default file and overwrite the current config
+	cp /etc/apt/50unattended-upgrades.backup "$config_file"
+
+	# Recreate the default config
+	distro_codename=$(lsb_release -cs)
+	# Allow security update
+	ynh_replace_string "//\(.*\"o=Debian,n=${distro_codename},l=Debian-Security\";\)" "\1" "$config_file"
+	# Allow other updates
+	if [ "$upgrade_level" = "Security and updates" ]
+	then
+		ynh_replace_string "//\(.*\"o=Debian,n=$distro_codename\";\)" "\1" "$config_file"
+		ynh_replace_string "//\(.*\"o=Debian,n=$distro_codename-updates\";\)" "\1" "$config_file"
+	fi
+
+	# Add YunoHost upgrade source
+	if [ $ynh_update -eq 1 ]
+	then
+		ynh_replace_string "origin=Debian,codename=\${distro_codename},label=Debian-Security\";" \
+			"&\n\n        //YunoHost upgrade\n        \"o=YunoHost,n=$distro_codename\";" "$config_file"
+	fi
+
+	# Allow MinimalSteps upgrading to reduce risk in case of reboot
+	ynh_replace_string "//\(Unattended-Upgrade::MinimalSteps\).*" "\1 \"true\";" "$config_file"
+
+	# Configure Unattended Upgrades mailing
+	if [ "$unattended_mail" = "If an upgrade has been done" ]
+	then
+		# Allow mail to root
+		ynh_replace_string "//\(Unattended-Upgrade::Mail \)" "\1" "$config_file"
+
+		# Send mail even if there's no errors
+		ynh_replace_string "//\(Unattended-Upgrade::MailOnlyOnError \).*" "\1\"false\";" "$config_file"
+
+	elif [ "$unattended_mail" = "Only if there was an error" ]
+	then
+		# Allow mail to root
+		ynh_replace_string "//\(Unattended-Upgrade::Mail \)" "\1" "$config_file"
+
+		# Send mail only if there's an error
+		ynh_replace_string "//\(Unattended-Upgrade::MailOnlyOnError \).*" "\1\"true\";" "$config_file"
+
+	else	# "Never"
+		# Comment "Unattended-Upgrade::Mail" if isn't already commented
+		ynh_replace_string "^\(Unattended-Upgrade::Mail \)" "//\1" "$config_file"
+	fi
+fi
+
+if [ "$file" = "02periodic" ]
+then
+	# Get the default file and overwrite the current config
+	cp /etc/yunohost/apps/$app/conf/02periodic "$config_file"
+
+	# Recreate the default config
+	ynh_replace_string "__VERBOSITY__" "$unattended_verbosity" "/etc/apt/apt.conf.d/02periodic"
+fi
+
+# Calculate and store the config file checksum into the app settings
+ynh_store_file_checksum "$config_file"
diff --git a/scripts/config b/scripts/config
new file mode 100644
index 0000000..be074e4
--- /dev/null
+++ b/scripts/config
@@ -0,0 +1,221 @@
+#!/bin/bash
+
+#=================================================
+# GENERIC STARTING
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+source _common.sh
+source /usr/share/yunohost/helpers
+
+#=================================================
+# RETRIEVE ARGUMENTS
+#=================================================
+
+app=${YNH_APP_INSTANCE_NAME:-$YNH_APP_ID}
+
+final_path=$(ynh_app_setting_get $app final_path)
+
+#=================================================
+# SPECIFIC CODE
+#=================================================
+# LOAD VALUES
+#=================================================
+
+# Load the real value from the app config or elsewhere.
+# Then get the value from the form.
+# If the form has a value for a variable, take the value from the form,
+# Otherwise, keep the value from the app config.
+
+# upgrade_level
+old_upgrade_level="$(ynh_app_setting_get $app upgrade_level)"
+upgrade_level="${YNH_CONFIG_MAIN_UNATTENDED_CONFIGURATION_UPGRADE_LEVEL:-$old_upgrade_level}"
+# ynh_update
+old_ynh_update="$(ynh_app_setting_get $app ynh_update)"
+old_ynh_update=$(bool_to_true_false $old_ynh_update)
+ynh_update="${YNH_CONFIG_MAIN_UNATTENDED_CONFIGURATION_YNH_UPDATE:-$old_ynh_update}"
+# unattended_mail
+old_unattended_mail="$(ynh_app_setting_get $app unattended_mail)"
+unattended_mail="${YNH_CONFIG_MAIN_UNATTENDED_CONFIGURATION_UNATTENDED_MAIL:-$old_unattended_mail}"
+
+# previous_apticron
+old_previous_apticron="$(ynh_app_setting_get $app previous_apticron)"
+old_previous_apticron=$(bool_to_true_false $old_previous_apticron)
+previous_apticron="${YNH_CONFIG_MAIN_APTICRON_CONFIGURATION_PREVIOUS_APTICRON:-$old_previous_apticron}"
+# previous_apticron_hour
+old_previous_apticron_hour="$(cat /etc/cron.d/apticron | grep --max-count=1 "^#*0.*root if.*" | cut -d' ' -f2)"
+previous_apticron_hour="${YNH_CONFIG_MAIN_APTICRON_CONFIGURATION_PREVIOUS_APTICRON_HOUR:-$old_previous_apticron_hour}"
+# after_apticron
+old_after_apticron="$(ynh_app_setting_get $app after_apticron)"
+old_after_apticron=$(bool_to_true_false $old_after_apticron)
+after_apticron="${YNH_CONFIG_MAIN_APTICRON_CONFIGURATION_AFTER_APTICRON:-$old_after_apticron}"
+# after_apticron_hour
+old_after_apticron_hour="$(tac /etc/cron.d/apticron | grep --max-count=1 "^#*0.*root if.*" | cut -d' ' -f2)"
+after_apticron_hour="${YNH_CONFIG_MAIN_APTICRON_CONFIGURATION_AFTER_APTICRON_HOUR:-$old_after_apticron_hour}"
+
+# unattended_verbosity
+old_unattended_verbosity="$(ynh_app_setting_get $app unattended_verbosity)"
+unattended_verbosity="${YNH_CONFIG_MAIN_PERIODIC_CONFIGURATION_UNATTENDED_VERBOSITY:-$old_unattended_verbosity}"
+
+# Overwrite 02periodic config file
+old_overwrite_periodic="$(ynh_app_setting_get $app overwrite_periodic)"
+old_overwrite_periodic=$(bool_to_true_false $old_overwrite_periodic)
+overwrite_periodic="${YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_PERIODIC:-$old_overwrite_periodic}"
+
+#=================================================
+# SHOW_CONFIG FUNCTION FOR 'SHOW' COMMAND
+#=================================================
+
+show_config() {
+	# here you are supposed to read some config file/database/other then print the values
+	# echo "YNH_CONFIG_${PANEL_ID}_${SECTION_ID}_${OPTION_ID}=value"
+
+	echo "YNH_CONFIG_MAIN_UNATTENDED_CONFIGURATION_UPGRADE_LEVEL=$upgrade_level"
+	echo "YNH_CONFIG_MAIN_UNATTENDED_CONFIGURATION_YNH_UPDATE=$ynh_update"
+	echo "YNH_CONFIG_MAIN_UNATTENDED_CONFIGURATION_UNATTENDED_MAIL=$unattended_mail"
+
+	echo "YNH_CONFIG_MAIN_APTICRON_CONFIGURATION_PREVIOUS_APTICRON=$previous_apticron"
+	echo "YNH_CONFIG_MAIN_APTICRON_CONFIGURATION_PREVIOUS_APTICRON_HOUR=$previous_apticron_hour"
+	echo "YNH_CONFIG_MAIN_APTICRON_CONFIGURATION_AFTER_APTICRON=$after_apticron"
+	echo "YNH_CONFIG_MAIN_APTICRON_CONFIGURATION_AFTER_APTICRON_HOUR=$after_apticron_hour"
+
+	echo "YNH_CONFIG_MAIN_PERIODIC_CONFIGURATION_UNATTENDED_VERBOSITY=$unattended_verbosity"
+
+	echo "YNH_CONFIG_MAIN_OVERWRITE_FILES_OVERWRITE_PERIODIC=$overwrite_periodic"
+}
+
+#=================================================
+# MODIFY THE CONFIGURATION
+#=================================================
+
+apply_config() {
+	# Change configuration if needed
+	unattended_upgrades_config="/etc/apt/apt.conf.d/50unattended-upgrades"
+	# upgrade_level
+	if [ "$upgrade_level" != "$old_upgrade_level" ]
+	then
+		if [ "$upgrade_level" = "Security and updates" ]
+		then
+			# Uncomment lines in the config
+			ynh_replace_string "//\( *\"o=Debian,a=stable\)" "  \1" "$unattended_upgrades_config"
+			ynh_replace_string "//\( *\"o=Debian,a=stable-updates\)" "  \1" "$unattended_upgrades_config"
+		else
+			# Comment lines in the config
+			ynh_replace_string "^  \( *\"o=Debian,a=stable\)" "//\1" "$unattended_upgrades_config"
+			ynh_replace_string "^  \( *\"o=Debian,a=stable-updates\)" "//\1" "$unattended_upgrades_config"
+		fi
+		ynh_app_setting_set $app upgrade_level "$upgrade_level"
+	fi
+	# ynh_update
+	if [ "$ynh_update" != "$old_ynh_update" ]
+	then
+		ynh_update=$(bool_to_01 $ynh_update)
+		if [ "$ynh_update" -eq 1 ]
+		then
+			# Add YunoHost upgrade source
+			ynh_replace_string "origin=Debian,codename=\${distro_codename},label=Debian-Security\";" \
+				"&\n\n        //YunoHost upgrade\n        \"o=YunoHost,a=stable\";" "$unattended_upgrades_config"
+		else
+			# Remove lines about YunoHost
+			sed --in-place '/YunoHost upgrade/d' "$unattended_upgrades_config"
+			sed --in-place '/o=YunoHost/d' "$unattended_upgrades_config"
+		fi
+		ynh_app_setting_set $app ynh_update "$ynh_update"
+	fi
+	# unattended_mail
+	if [ "$unattended_mail" != "$old_unattended_mail" ]
+	then
+		if [ "$unattended_mail" = "If an upgrade has been done" ]
+		then
+			# Allow mail to root
+			ynh_replace_string "/*\(Unattended-Upgrade::Mail \)" "\1" "$unattended_upgrades_config"
+
+			# Send mail even if there's no errors
+			ynh_replace_string "/*\(Unattended-Upgrade::MailOnlyOnError \).*" "\1\"false\";" "$unattended_upgrades_config"
+
+		elif [ "$unattended_mail" = "Only if there was an error" ]
+		then
+			# Allow mail to root
+			ynh_replace_string "/*\(Unattended-Upgrade::Mail \)" "\1" "$unattended_upgrades_config"
+
+			# Send mail only if there's an error
+			ynh_replace_string "/*\(Unattended-Upgrade::MailOnlyOnError \).*" "\1\"true\";" "$unattended_upgrades_config"
+
+		else	# "Never"
+			# Comment "Unattended-Upgrade::Mail"
+			ynh_replace_string "^\(Unattended-Upgrade::Mail \)" "//\1" "$unattended_upgrades_config"
+		fi
+		ynh_app_setting_set $app unattended_mail "$unattended_mail"
+	fi
+
+	# previous_apticron
+	apticron_cron="/etc/cron.d/apticron"
+	if [ "$previous_apticron" != "$old_previous_apticron" ]
+	then
+		previous_apticron=$(bool_to_01 $previous_apticron)
+		if [ "$previous_apticron" = "1" ]
+		then
+			# Uncomment the first cron line
+			ynh_replace_string "^#\(0 $old_previous_apticron_hour .*\)" "\1" "$apticron_cron"
+		else
+			# Comment the first cron line
+			ynh_replace_string "^0 $old_previous_apticron_hour .*" "#&" "$apticron_cron"
+		fi
+		ynh_app_setting_set $app previous_apticron "$previous_apticron"
+	fi
+	# previous_apticron_hour
+	if [ "$previous_apticron_hour" != "$old_previous_apticron_hour" ]
+	then
+		# Use sed instead of ynh_replace_string to avoid the 'global' argument
+		sed --in-place "s/0 $old_previous_apticron_hour\( \* \* \* root if\)/0 $previous_apticron_hour\1/" "$apticron_cron"
+		ynh_app_setting_set $app previous_apticron_hour "$previous_apticron_hour"
+	fi
+	# after_apticron
+	if [ "$after_apticron" != "$old_after_apticron" ]
+	then
+		after_apticron=$(bool_to_01 $after_apticron)
+		if [ "$after_apticron" = "1" ]
+		then
+			# Uncomment the second cron line
+			ynh_replace_string "^#\(0 $old_after_apticron_hour .*\)" "\1" "$apticron_cron"
+		else
+			# Comment the second cron line
+			ynh_replace_string "^0 $old_after_apticron_hour .*" "#&" "$apticron_cron"
+		fi
+		ynh_app_setting_set $app after_apticron "$after_apticron"
+	fi
+	# after_apticron_hour
+	if [ "$after_apticron_hour" != "$old_after_apticron_hour" ]
+	then
+		# Use sed instead of ynh_replace_string to avoid the 'global' argument
+		sed --in-place "s/0 $old_after_apticron_hour\( \* \* \* root if\)/0 $after_apticron_hour\1/" "$apticron_cron"
+		ynh_app_setting_set $app after_apticron_hour "$after_apticron_hour"
+	fi
+
+	# unattended_verbosity
+	if [ "$unattended_verbosity" != "$old_unattended_verbosity" ]
+	then
+		ynh_backup_if_checksum_is_different "/etc/apt/apt.conf.d/02periodic"
+
+		ynh_replace_string "^APT::Periodic::Verbose \".*" "APT::Periodic::Verbose \"$unattended_verbosity\";" "/etc/apt/apt.conf.d/02periodic"
+		ynh_app_setting_set $app unattended_verbosity "$unattended_verbosity"
+
+		ynh_store_file_checksum "/etc/apt/apt.conf.d/02periodic"
+	fi
+
+	# Set overwrite_periodic
+	overwrite_periodic=$(bool_to_01 $overwrite_periodic)
+	ynh_app_setting_set $app overwrite_periodic "$overwrite_periodic"
+}
+
+#=================================================
+# GENERIC FINALIZATION
+#=================================================
+# SELECT THE ACTION FOLLOWING THE GIVEN ARGUMENT
+#=================================================
+
+case $1 in
+  show) show_config;;
+  apply) apply_config;;
+esac
diff --git a/scripts/install b/scripts/install
index ace65fc..c3c199d 100644
--- a/scripts/install
+++ b/scripts/install
@@ -32,12 +32,13 @@ app=$YNH_APP_INSTANCE_NAME
 # STORE SETTINGS FROM MANIFEST
 #=================================================
 
-ynh_app_setting_set $app upgrade_level $upgrade_level
+ynh_app_setting_set $app upgrade_level "$upgrade_level"
 ynh_app_setting_set $app ynh_update $ynh_update
 ynh_app_setting_set $app previous_apticron $previous_apticron
 ynh_app_setting_set $app after_apticron $after_apticron
-ynh_app_setting_set $app unattended_mail $unattended_mail
+ynh_app_setting_set $app unattended_mail "$unattended_mail"
 ynh_app_setting_set $app unattended_verbosity $unattended_verbosity
+ynh_app_setting_set $app overwrite_periodic "1"
 
 #=================================================
 # STANDARD MODIFICATIONS
@@ -64,26 +65,23 @@ ynh_replace_string "# CUSTOM_NO_UPDATES_SUBJECT=.*" \
 #=================================================
 
 unattended_upgrades_config="/etc/apt/apt.conf.d/50unattended-upgrades"
-distro_codename=$(lsb_release -cs)
 
 # Make a backup of 50unattended-upgrades
 cp -a "$unattended_upgrades_config" "/etc/apt/50unattended-upgrades.backup"
 
 # Configure upgrade sources
-# Allow security update
-ynh_replace_string "//\(.*\"o=Debian,n=${distro_codename},l=Debian-Security\";\)" "\1" "$unattended_upgrades_config"
 # Allow other updates
 if [ "$upgrade_level" = "Security and updates" ]
 then
-	ynh_replace_string "//\(.*\"o=Debian,n=$distro_codename\";\)" "\1" "$unattended_upgrades_config"
-	ynh_replace_string "//\(.*\"o=Debian,n=$distro_codename-updates\";\)" "\1" "$unattended_upgrades_config"
+	ynh_replace_string "//\(.*\"o=Debian,a=stable\)" "\1" "$unattended_upgrades_config"
+	ynh_replace_string "//\(.*\"o=Debian,a=stable-updates\)" "\1" "$unattended_upgrades_config"
 fi
 
 # Add YunoHost upgrade source
 if [ $ynh_update -eq 1 ]
 then
 	ynh_replace_string "origin=Debian,codename=\${distro_codename},label=Debian-Security\";" \
-		"&\n\n        //YunoHost upgrade\n        \"o=YunoHost,n=$distro_codename\";" "$unattended_upgrades_config"
+		"&\n\n        //YunoHost upgrade\n        \"o=YunoHost,a=stable\";" "$unattended_upgrades_config"
 fi
 
 # Allow MinimalSteps upgrading to reduce risk in case of reboot
diff --git a/scripts/upgrade b/scripts/upgrade
index cf2728b..75cd019 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -8,7 +8,6 @@
 
 source _common.sh
 source /usr/share/yunohost/helpers
-source _sed
 
 #=================================================
 # LOAD SETTINGS
@@ -17,6 +16,7 @@ source _sed
 app=$YNH_APP_INSTANCE_NAME
 
 unattended_verbosity=$(ynh_app_setting_get $app unattended_verbosity)
+overwrite_periodic=$(ynh_app_setting_get $app overwrite_periodic)
 
 #=================================================
 # CHECK VERSION
@@ -24,6 +24,16 @@ unattended_verbosity=$(ynh_app_setting_get $app unattended_verbosity)
 
 upgrade_type=$(ynh_check_app_version_changed)
 
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+
+# If overwrite_periodic doesn't exist, create it
+if [ -z "$overwrite_periodic" ]; then
+	overwrite_periodic=1
+	ynh_app_setting_set $app overwrite_periodic $overwrite_periodic
+fi
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
@@ -65,13 +75,17 @@ ynh_install_app_dependencies apticron unattended-upgrades apt-listchanges
 # UPGRADE APT PERIODIC FOR UNATTENDED
 #=================================================
 
-ynh_backup_if_checksum_is_different "/etc/apt/apt.conf.d/02periodic"
+# Overwrite 02periodic config file only if it's allowed
+if [ $overwrite_periodic -eq 1 ]
+then
+	ynh_backup_if_checksum_is_different "/etc/apt/apt.conf.d/02periodic"
 
-cp "../conf/02periodic" "/etc/apt/apt.conf.d/02periodic"
-ynh_replace_string "__VERBOSITY__" "$unattended_verbosity" "/etc/apt/apt.conf.d/02periodic"
-# This config file is used by /etc/cron.daily/apt
+	cp "../conf/02periodic" "/etc/apt/apt.conf.d/02periodic"
+	ynh_replace_string "__VERBOSITY__" "$unattended_verbosity" "/etc/apt/apt.conf.d/02periodic"
+	# This config file is used by /etc/cron.daily/apt
 
-ynh_store_file_checksum "/etc/apt/apt.conf.d/02periodic"
+	ynh_store_file_checksum "/etc/apt/apt.conf.d/02periodic"
+fi
 
 #=================================================
 # UPGRADE APTICRON CRON FILE