diff --git a/scripts/backup b/scripts/backup
index 32c9dcf..dde34f2 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -14,15 +14,13 @@ source /usr/share/yunohost/helpers
 # MANAGE SCRIPT FAILURE
 #=================================================
 
-ynh_clean_setup () {
-	true
-}
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
 #=================================================
 # LOAD SETTINGS
 #=================================================
+ynh_print_info --message="Loading installation settings..."
 
 app=$YNH_APP_INSTANCE_NAME
 
@@ -35,24 +33,28 @@ db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 #=================================================
 # BACKUP THE APP MAIN DIR
 #=================================================
+ynh_print_info --message="Backing up the main app directory..."
 
 ynh_backup --src_path="$final_path"
 
 #=================================================
 # BACKUP THE NGINX CONFIGURATION
 #=================================================
+ynh_print_info --message="Backing up nginx web server configuration..."
 
 ynh_backup --src_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 
 #=================================================
 # BACKUP THE PHP-FPM CONFIGURATION
 #=================================================
+ynh_print_info --message="Backing up php-fpm configuration..."
 
 ynh_backup --src_path="/etc/php/7.0/fpm/pool.d/$app.conf"
 
 #=================================================
 # BACKUP THE MYSQL DATABASE
 #=================================================
+ynh_print_info --message="Backing up the MySQL database..."
 
 ynh_mysql_dump_db --database="$db_name" > db.sql
 
@@ -65,3 +67,5 @@ ynh_backup --src_path="/etc/cron.d/$app"
 #=================================================
 # END OF SCRIPT
 #=================================================
+
+ynh_print_info --message="Backup script completed for $app. (YunoHost will then actually copy those files to the archive)."
diff --git a/scripts/install b/scripts/install
index 9ffcaa7..86ba8fa 100755
--- a/scripts/install
+++ b/scripts/install
@@ -14,9 +14,6 @@ source /usr/share/yunohost/helpers
 # MANAGE SCRIPT FAILURE
 #=================================================
 
-ynh_clean_setup () {
-	true
-}
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
@@ -33,6 +30,7 @@ app=$YNH_APP_INSTANCE_NAME
 #=================================================
 # CHECK IF THE APP CAN BE INSTALLED WITH THESE ARGS
 #=================================================
+ynh_print_info --message="Validating installation parameters..."
 
 final_path=/var/www/$app
 test ! -e "$final_path" || ynh_die --message="This path already contains a folder"
@@ -43,6 +41,7 @@ ynh_webpath_register $app $domain $path_url
 #=================================================
 # STORE SETTINGS FROM MANIFEST
 #=================================================
+ynh_print_info --message="Storing installation settings..."
 
 ynh_app_setting_set --app=$app --key=domain --value=$domain
 ynh_app_setting_set --app=$app --key=path --value=$path_url
@@ -53,12 +52,14 @@ ynh_app_setting_set --app=$app --key=is_public --value=$is_public
 #=================================================
 # INSTALL DEPENDENCIES
 #=================================================
+ynh_print_info --message="Installing dependencies..."
 
 ynh_install_app_dependencies $pkg_dependencies
 
 #=================================================
 # CREATE A MYSQL DATABASE
 #=================================================
+ynh_print_info --message="Creating a MySQL database..."
 
 db_name=$(ynh_sanitize_dbid --db_name=$app)
 db_user=$db_name
@@ -68,6 +69,7 @@ ynh_mysql_setup_db --db_user=$db_user --db_name=$db_name
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
+ynh_print_info --message="Setting up source files..."
 
 ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 # Download, check integrity, uncompress and patch the source from app.src
@@ -76,6 +78,7 @@ ynh_setup_source --dest_dir="$final_path"
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
+ynh_print_info --message="Configuring nginx web server..."
 
 # Create a dedicated nginx config
 ynh_add_nginx_config
@@ -83,6 +86,7 @@ ynh_add_nginx_config
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
+ynh_print_info --message="Configuring system user..."
 
 # Create a system user
 ynh_system_user_create --username=$app
@@ -90,6 +94,7 @@ ynh_system_user_create --username=$app
 #=================================================
 # PHP-FPM CONFIGURATION
 #=================================================
+ynh_print_info --message="Configuring php-fpm..."
 
 # Create a dedicated php-fpm config
 ynh_add_fpm_config
@@ -99,13 +104,14 @@ ynh_add_fpm_config
 #=================================================
 # INSTALL COMPOSER AND DEPENDENCIES
 #=================================================
+ynh_print_info --message="Installing composer and dependencies..."
 
 ynh_install_composer --phpversion="7.0" --workdir=$final_path
 
 #=================================================
 # SETUP A CRON
 #=================================================
-
+ynh_print_info --message="Setuping a cron..."
 ynh_replace_string  --match_string="YNH_WWW_PATH" --replace_string="$final_path" --target_file="../conf/cron"
 ynh_replace_string --match_string="__USER__" --replace_string="$app"  --target_file="../conf/cron"
 ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain"  --target_file="../conf/cron"
@@ -123,6 +129,17 @@ cp -f ../conf/cron /etc/cron.d/$app
 ## ynh_replace_string "__DB_PASSWORD__" "$db_pwd"  "$final_path/config/config.ini.php"
 
 
+#=================================================
+# STORE THE CONFIG FILE CHECKSUM
+#=================================================
+
+### `ynh_store_file_checksum` is used to store the checksum of a file.
+### That way, during the upgrade script, by using `ynh_backup_if_checksum_is_different`,
+### you can make a backup of this file before modifying it again if the admin had modified it.
+
+# Calculate and store the config file checksum into the app settings
+## ynh_store_file_checksum --file="$final_path/CONFIG_FILE"
+
 #=================================================
 # GENERIC FINALIZATION
 #=================================================
@@ -135,6 +152,7 @@ chown -R $app: $final_path
 #=================================================
 # SETUP SSOWAT
 #=================================================
+ynh_print_info --message="Configuring SSOwat..."
 
 # Make app public if necessary
 if [ $is_public -eq 1 ]
@@ -146,12 +164,14 @@ fi
 #=================================================
 # RELOAD NGINX
 #=================================================
+ynh_print_info --message="Reloading nginx web server..."
 
 ynh_systemd_action --service_name=nginx --action=reload
 
 #=================================================
 # SEND A README FOR THE ADMIN
 #=================================================
+ynh_print_info --message="Sending a readme for the admin..."
 
 message=" $app was successfully installed :)
 Please open your $app domain: https://$domain$path_url
@@ -168,3 +188,5 @@ ynh_send_readme_to_admin "$message"
 #=================================================
 # END OF SCRIPT
 #=================================================
+
+ynh_print_info --message="Installation of $app completed"
diff --git a/scripts/remove b/scripts/remove
index 581808f..01dfc06 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -12,6 +12,7 @@ source /usr/share/yunohost/helpers
 #=================================================
 # LOAD SETTINGS
 #=================================================
+ynh_print_info --message="Loading installation settings..."
 
 app=$YNH_APP_INSTANCE_NAME
 
@@ -25,6 +26,7 @@ final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 #=================================================
 # REMOVE THE MYSQL DATABASE
 #=================================================
+ynh_print_info --message="Removing the MySQL database..."
 
 # Remove a database if it exists, along with the associated user
 ynh_mysql_remove_db --db_user=$db_user --db_name=$db_name
@@ -32,6 +34,7 @@ ynh_mysql_remove_db --db_user=$db_user --db_name=$db_name
 #=================================================
 # REMOVE DEPENDENCIES
 #=================================================
+ynh_print_info --message="Removing dependencies..."
 
 # Remove metapackage and its dependencies
 ynh_remove_app_dependencies
@@ -39,6 +42,7 @@ ynh_remove_app_dependencies
 #=================================================
 # REMOVE APP MAIN DIR
 #=================================================
+ynh_print_info --message="Removing app main directory..."
 
 # Remove the app directory securely
 ynh_secure_remove --file="$final_path"
@@ -46,6 +50,7 @@ ynh_secure_remove --file="$final_path"
 #=================================================
 # REMOVE NGINX CONFIGURATION
 #=================================================
+ynh_print_info --message="Removing nginx web server configuration..."
 
 # Remove the dedicated nginx config
 ynh_remove_nginx_config
@@ -53,6 +58,7 @@ ynh_remove_nginx_config
 #=================================================
 # REMOVE PHP-FPM CONFIGURATION
 #=================================================
+ynh_print_info --message="Removing php-fpm configuration..."
 
 # Remove the dedicated php-fpm config
 ynh_remove_fpm_config
@@ -71,6 +77,7 @@ ynh_secure_remove "/etc/cron.d/$app"
 #=================================================
 # REMOVE DEDICATED USER
 #=================================================
+ynh_print_info --message="Removing the dedicated system user..."
 
 # Delete a system user
 ynh_system_user_delete --username=$app
@@ -78,3 +85,5 @@ ynh_system_user_delete --username=$app
 #=================================================
 # END OF SCRIPT
 #=================================================
+
+ynh_print_info --message="Removal of $app completed"
diff --git a/scripts/restore b/scripts/restore
index 1002e9d..07ac747 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -14,15 +14,13 @@ source /usr/share/yunohost/helpers
 # MANAGE SCRIPT FAILURE
 #=================================================
 
-ynh_clean_setup () {
-	true
-}
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
 #=================================================
 # LOAD SETTINGS
 #=================================================
+ynh_print_info --message="Loading settings..."
 
 app=$YNH_APP_INSTANCE_NAME
 
@@ -35,6 +33,7 @@ db_user=$db_name
 #=================================================
 # CHECK IF THE APP CAN BE RESTORED
 #=================================================
+ynh_print_info --message="Validating restoration parameters..."
 
 ynh_webpath_available --domain=$domain --path_url=$path_url \
 	|| ynh_die --message="Path not available: ${domain}${path_url}"
@@ -52,12 +51,14 @@ ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 #=================================================
 # RESTORE THE APP MAIN DIR
 #=================================================
+ynh_print_info --message="Restoring the app main directory..."
 
 ynh_restore_file --origin_path="$final_path"
 
 #=================================================
 # RECREATE THE DEDICATED USER
 #=================================================
+ynh_print_info --message="Recreating the dedicated system user..."
 
 # Create the dedicated user (if not existing)
 ynh_system_user_create --username=$app
@@ -80,6 +81,7 @@ ynh_restore_file --origin_path="/etc/php/7.0/fpm/pool.d/$app.conf"
 #=================================================
 # REINSTALL DEPENDENCIES
 #=================================================
+ynh_print_info --message="Reinstalling dependencies..."
 
 # Define and install dependencies
 ynh_install_app_dependencies $pkg_dependencies
@@ -87,6 +89,7 @@ ynh_install_app_dependencies $pkg_dependencies
 #=================================================
 # RESTORE THE MYSQL DATABASE
 #=================================================
+ynh_print_info --message="Restoring the MySQL database..."
 
 db_pwd=$(ynh_app_setting_get --app=$app --key=mysqlpwd)
 ynh_mysql_setup_db --db_user=$db_user --db_name=$db_name --db_pwd=$db_pwd
@@ -103,6 +106,7 @@ ynh_restore_file --origin_path="/etc/cron.d/$app"
 #=================================================
 # RELOAD NGINX AND PHP-FPM
 #=================================================
+ynh_print_info --message="Reloading nginx web server and php-fpm..."
 
 ynh_systemd_action --service_name=php7.0-fpm --action=reload
 ynh_systemd_action --service_name=nginx --action=reload
@@ -111,3 +115,4 @@ ynh_systemd_action --service_name=nginx --action=reload
 # END OF SCRIPT
 #=================================================
 
+ynh_print_info --message="Restoration completed for $app"
diff --git a/scripts/upgrade b/scripts/upgrade
index ff0d8c2..adf11fb 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -31,6 +31,7 @@ upgrade_type=$(ynh_check_app_version_changed)
 #=================================================
 # ENSURE DOWNWARD COMPATIBILITY
 #=================================================
+ynh_print_info --message="Ensuring downward compatibility..."
 
 # Fix is_public as a boolean value
 if [ "$is_public" = "Yes" ]; then
@@ -56,6 +57,7 @@ fi
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
+ynh_print_info --message="Backing up the app before upgrading (may take a while)..."
 
 # Backup the current version of the app
 ynh_backup_before_upgrade
@@ -81,7 +83,7 @@ path_url=$(ynh_normalize_url_path --path_url=$path_url)
 
 if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
-	ynh_script_progression --message="Upgrading source files..." --time --weight=1
+	ynh_print_info --message="Upgrading source files..." --time --weight=1
 
 	# Download, check integrity, uncompress and patch the source from app.src
 	ynh_setup_source --dest_dir="$final_path"
@@ -90,6 +92,7 @@ fi
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
+ynh_print_info --message="Upgrading nginx web server configuration..."
 
 # Create a dedicated nginx config
 ynh_add_nginx_config
@@ -97,12 +100,14 @@ ynh_add_nginx_config
 #=================================================
 # UPGRADE DEPENDENCIES
 #=================================================
+ynh_print_info --message="Upgrading dependencies..."
 
 ynh_install_app_dependencies $pkg_dependencies
 
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
+ynh_print_info --message="Making sure dedicated system user exists..."
 
 # Create a dedicated user (if not existing)
 ynh_system_user_create --username=$app
@@ -110,6 +115,7 @@ ynh_system_user_create --username=$app
 #=================================================
 # PHP-FPM CONFIGURATION
 #=================================================
+ynh_print_info --message="Upgrading php-fpm configuration..."
 
 # Create a dedicated php-fpm config
 ynh_add_fpm_config
@@ -119,12 +125,13 @@ ynh_add_fpm_config
 #=================================================
 # INSTALL COMPOSER AND DEPENDENCIES
 #=================================================
-
+ynh_print_info --message="Installating composer and dependencies..."
 ynh_install_composer --phpversion="7.0" --workdir=$final_path
 
 #=================================================
-# SETUP CRON
+# SETUP A CRON
 #=================================================
+ynh_print_info --message="Setuping a cron..."
 
 ynh_replace_string  --match_string="YNH_WWW_PATH" --replace_string="$final_path" --target_file="../conf/cron"
 ynh_replace_string --match_string="__USER__" --replace_string="$app"  --target_file="../conf/cron"
@@ -144,6 +151,7 @@ chown -R $app: $final_path
 #=================================================
 # SETUP SSOWAT
 #=================================================
+ynh_print_info --message="Upgrading SSOwat configuration..."
 
 # Make app public if necessary
 if [ $is_public -eq 1 ]
@@ -155,6 +163,7 @@ fi
 #=================================================
 # RELOAD NGINX
 #=================================================
+ynh_print_info --message="Reloading nginx web server..."
 
 ynh_systemd_action --service_name=nginx --action=reload
 
@@ -162,3 +171,4 @@ ynh_systemd_action --service_name=nginx --action=reload
 # END OF SCRIPT
 #=================================================
 
+ynh_print_info --message="Upgrade of $app completed"