diff --git a/scripts/_common.sh b/scripts/_common.sh
index bcf683f..d87bcd7 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -1,66 +1,14 @@
-#!/bin/bash 
+#=================================================
+# SET ALL CONSTANTS
+#=================================================
 
-# Retrieve arguments
 app=$YNH_APP_INSTANCE_NAME
-
-# Detect the system architecture to download the right tarball
-# NOTE: `uname -m` is more accurate and universal than `arch`
-# See https://en.wikipedia.org/wiki/Uname
-if [ -n "$(uname -m | grep 64)" ]; then
-	architecture="x86-64"
-elif [ -n "$(uname -m | grep 86)" ]; then
-	architecture="i386"
-elif [ -n "$(uname -m | grep arm)" ]; then
-	architecture="arm"
-else
-	ynh_die "Unable to detect your achitecture, please open a bug describing \
-        your hardware and the result of the command \"uname -m\"." 1
-fi
-
-# Read the value of a key in a ynh manifest file
-#
-# usage: ynh_read_manifest manifest key
-# | arg: manifest - Path of the manifest to read
-# | arg: key - Name of the key to find
-ynh_read_manifest () {
-	manifest="$1"
-	key="$2"
-	python3 -c "import sys, json;print(json.load(open('$manifest'))['$key'])"
-}
-
-# Read the upstream version from the manifest 
-# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
-# For example : 4.3-2~ynh3
-# This include the number before ~ynh
-# In the last example it return 4.3-2
-#
-# usage: ynh_app_upstream_version
-ynh_app_upstream_version () {
-    manifest_path="../manifest.json"
-    if [ ! -e "$manifest_path" ]; then
-        manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
-    fi
-    version_key=$(ynh_read_manifest "$manifest_path" "version")
-    echo "${version_key/~ynh*/}"
-}
-
-# Read package version from the manifest
-# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
-# For example : 4.3-2~ynh3
-# This include the number after ~ynh
-# In the last example it return 3
-#
-# usage: ynh_app_package_version
-ynh_app_package_version () {
-    manifest_path="../manifest.json"
-    if [ ! -e "$manifest_path" ]; then
-        manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
-    fi
-    version_key=$(ynh_read_manifest "$manifest_path" "version")
-    echo "${version_key/*~ynh/}"
-}
 seafile_version=$(ynh_app_upstream_version)
 
+#=================================================
+# DEFINE ALL COMMON FONCTIONS
+#=================================================
+
 get_configuration() {
 	final_path=$(ynh_app_setting_get $app final_path)
 	seafile_user=$(ynh_app_setting_get $app seafile_user)
diff --git a/scripts/backup b/scripts/backup
index 232bb60..2ba60e7 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -1,5 +1,9 @@
 #!/bin/bash
 
+#=================================================
+# GENERIC START
+#=================================================
+
 # Source YunoHost helpers
 source /usr/share/yunohost/helpers
 
@@ -7,6 +11,7 @@ source /usr/share/yunohost/helpers
 ynh_abort_if_errors
 
 # Import common cmd
+source ../settings/scripts/experimental_helper.sh
 source ../settings/scripts/_common.sh
 
 # Set configuration for user and final path
@@ -16,6 +21,10 @@ get_configuration
 domain=$(ynh_app_setting_get ${app} domain)
 db_pwd=$(ynh_app_setting_get ${app} mysqlpwd)
 
+#=================================================
+# STANDARD BACKUP STEPS
+#=================================================
+
 # # Backup app files
 ynh_backup $final_path
 ynh_backup /home/yunohost.app/seafile-data "data" 1
diff --git a/scripts/change_url b/scripts/change_url
index e03095c..8566d5d 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -1,5 +1,9 @@
 #!/bin/bash
 
+#=================================================
+# GENERIC START
+#=================================================
+
 # Source YunoHost helpers
 source /usr/share/yunohost/helpers
 
@@ -7,6 +11,7 @@ source /usr/share/yunohost/helpers
 ynh_abort_if_errors
 
 # Import common cmd
+source ./experimental_helper.sh
 source ./_common.sh
 
 # Retrive arguments
@@ -53,7 +58,10 @@ then
 	change_path=1
 fi
 
+#=================================================
 # STANDARD MODIFICATIONS
+#=================================================
+
 # MODIFY URL IN NGINX CONF
 nginx_conf_path=/etc/nginx/conf.d/$old_domain.d/$app.conf
 
diff --git a/scripts/experimental_helper.sh b/scripts/experimental_helper.sh
new file mode 100644
index 0000000..cd54da0
--- /dev/null
+++ b/scripts/experimental_helper.sh
@@ -0,0 +1,56 @@
+# Detect the system architecture to download the right tarball
+# NOTE: `uname -m` is more accurate and universal than `arch`
+# See https://en.wikipedia.org/wiki/Uname
+if [ -n "$(uname -m | grep 64)" ]; then
+	architecture="x86-64"
+elif [ -n "$(uname -m | grep 86)" ]; then
+	architecture="i386"
+elif [ -n "$(uname -m | grep arm)" ]; then
+	architecture="arm"
+else
+	ynh_die "Unable to detect your achitecture, please open a bug describing \
+        your hardware and the result of the command \"uname -m\"." 1
+fi
+
+# Read the value of a key in a ynh manifest file
+#
+# usage: ynh_read_manifest manifest key
+# | arg: manifest - Path of the manifest to read
+# | arg: key - Name of the key to find
+ynh_read_manifest () {
+	manifest="$1"
+	key="$2"
+	python3 -c "import sys, json;print(json.load(open('$manifest'))['$key'])"
+}
+
+# Read the upstream version from the manifest 
+# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
+# For example : 4.3-2~ynh3
+# This include the number before ~ynh
+# In the last example it return 4.3-2
+#
+# usage: ynh_app_upstream_version
+ynh_app_upstream_version () {
+    manifest_path="../manifest.json"
+    if [ ! -e "$manifest_path" ]; then
+        manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
+    fi
+    version_key=$(ynh_read_manifest "$manifest_path" "version")
+    echo "${version_key/~ynh*/}"
+}
+
+# Read package version from the manifest
+# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
+# For example : 4.3-2~ynh3
+# This include the number after ~ynh
+# In the last example it return 3
+#
+# usage: ynh_app_package_version
+ynh_app_package_version () {
+    manifest_path="../manifest.json"
+    if [ ! -e "$manifest_path" ]; then
+        manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
+    fi
+    version_key=$(ynh_read_manifest "$manifest_path" "version")
+    echo "${version_key/*~ynh/}"
+} 
diff --git a/scripts/install b/scripts/install
index e338505..ebd13c6 100644
--- a/scripts/install
+++ b/scripts/install
@@ -1,5 +1,9 @@
 #!/bin/bash
 
+#=================================================
+# GENERIC START
+#=================================================
+
 # Source YunoHost helpers
 source /usr/share/yunohost/helpers
 
@@ -7,6 +11,7 @@ source /usr/share/yunohost/helpers
 ynh_abort_if_errors
 
 # Import common cmd
+source ./experimental_helper.sh
 source ./_common.sh
 
 # Retrieve arguments
@@ -49,6 +54,10 @@ ynh_app_setting_set $app installed_version $seafile_version
 # Retrieve admin email
 admin_email=$(yunohost user info $admin | grep mail: | sed "s/mail: //g")
 
+#=================================================
+# STANDARD MODIFICATIONS
+#=================================================
+
 # Check dependencies
 install_dependance
 
@@ -142,6 +151,10 @@ ynh_replace_special_string "__ADMIN_PASSWORD__" $admin_password "$final_path/fir
 su - $seafile_user -s /bin/bash -c "$final_path/first_launch.exp $final_path/seafile-server-$seafile_version $admin_email"
 ynh_secure_remove "$final_path/first_launch.exp"
 
+#=================================================
+# GENERIC FINALIZATION
+#=================================================
+
 # Add sso config to unprotect domain.tld/seafhttp + domain.tld/seafdav do in /etc/ssowat/conf.json.persistent
 cp ../conf/add_sso_conf.py $final_path
 cp ../conf/remove_sso_conf.py $final_path
diff --git a/scripts/remove b/scripts/remove
index 9d6ff03..5eb7dda 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -1,5 +1,9 @@
 #!/bin/bash
 
+#=================================================
+# GENERIC START
+#=================================================
+
 # Source YunoHost helpers
 source /usr/share/yunohost/helpers
 
@@ -7,6 +11,7 @@ source /usr/share/yunohost/helpers
 set -u
 
 # Import common cmd
+source ./experimental_helper.sh
 source ./_common.sh
 
 # Init get Final path
@@ -15,6 +20,10 @@ get_configuration
 # Retrieve arguments
 domain=$(ynh_app_setting_get $app domain)
 
+#=================================================
+# STANDARD REMOVE
+#=================================================
+
 systemctl stop seafile-server.service
 
 # remove sso config to unprotect domain.tld/seafhttp in /etc/ssowat/conf.json.persistent
diff --git a/scripts/restore b/scripts/restore
index 3038983..c79c36a 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -1,5 +1,9 @@
 #!/bin/bash
 
+#=================================================
+# GENERIC START
+#=================================================
+
 # Source YunoHost helpers
 source /usr/share/yunohost/helpers
 
@@ -7,6 +11,7 @@ source /usr/share/yunohost/helpers
 ynh_abort_if_errors
 
 # Import common cmd
+source ../settings/scripts/experimental_helper.sh
 source ../settings/scripts/_common.sh
 
 # Retrieve arguments
@@ -18,6 +23,10 @@ seafile_data=/home/yunohost.app/seafile-data
 # Check domain/path availability
 ynh_webpath_available $domain $path || ynh_die "$domain/$path is not available, please use an other domain or path."
 
+#=================================================
+# STANDARD RESTORATION STEPS
+#=================================================
+
 # Restore dependencies
 install_dependance
 
@@ -39,6 +48,10 @@ su -c "mysql -u ${app} -p$db_pwd ccnetdb < ${YNH_CWD}/ccnetdb.dmp"
 su -c "mysql -u ${app} -p$db_pwd seafiledb < ${YNH_CWD}/seafiledb.dmp"
 su -c "mysql -u ${app} -p$db_pwd seahubdb < ${YNH_CWD}/seahubdb.dmp"
 
+#=================================================
+# GENERIC FINALIZATION
+#=================================================
+
 # Restore sso persistent config
 python $final_path/add_sso_conf.py
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 4605550..f07ce44 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,5 +1,9 @@
 #!/bin/bash
 
+#=================================================
+# GENERIC START
+#=================================================
+
 # Source YunoHost helpers
 source /usr/share/yunohost/helpers
 
@@ -7,6 +11,7 @@ source /usr/share/yunohost/helpers
 ynh_abort_if_errors
 
 # Import common cmd
+source ./experimental_helper.sh
 source ./_common.sh
 
 # Init get Final path
@@ -30,6 +35,10 @@ set_path_2
 # stop seafile server
 systemctl stop seafile-server.service
 
+#=================================================
+# MIGRATION FROM OLD VERSION
+#=================================================
+
 # extract new version
 test -e $final_path/seafile-server-$seafile_version && ynh_secure_remove "$final_path/seafile-server-$seafile_version"
 install_source
@@ -130,6 +139,10 @@ fi
 # Fix local warning
 ynh_replace_string en_US.UTF-8 $LANG $final_path/seafile-server-$seafile_version/seahub.sh
 
+#=================================================
+# STANDARD UPGRADE STEPS
+#=================================================
+
 # Config nginx
 config_nginx
 
@@ -141,6 +154,10 @@ ynh_replace_string SEAFILE_USER $seafile_user /etc/init.d/seafile-server
 chmod +x /etc/init.d/seafile-server
 systemctl daemon-reload
 
+#=================================================
+# GENERIC FINALIZATION
+#=================================================
+
 # restore correct permissions
 chown -R $seafile_user:$seafile_user $final_path