diff --git a/conf/app.src b/conf/app.src
new file mode 100644
index 0000000..3d35992
--- /dev/null
+++ b/conf/app.src
@@ -0,0 +1,6 @@
+SOURCE_URL=https://github.com/audreyt/ethercalc/archive/0.20170704.0.tar.gz
+SOURCE_SUM=09d85c780c142c4a1c2c6099f52b8660b5f788c40b6f5d7bd37f0acfdf15b098
+SOURCE_SUM_PRG=sha256sum
+SOURCE_FORMAT=tar.gz
+SOURCE_IN_SUBDIR=true
+SOURCE_FILENAME=
diff --git a/scripts/backup b/scripts/backup
index 9549643..2938068 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -1,3 +1,62 @@
 #!/bin/bash
 
-#TODO
+#=================================================
+# GENERIC START
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+#Keep this path for calling _common.sh inside the execution's context of backup and restore scripts
+source ../settings/scripts/_common.sh
+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=$YNH_APP_INSTANCE_NAME
+
+final_path=$(ynh_app_setting_get --app=$app --key=final_path)
+domain=$(ynh_app_setting_get --app=$app --key=domain)
+
+#=================================================
+# DECLARE DATA AND CONF FILES TO BACKUP
+#=================================================
+ynh_print_info --message="Declaring files to be backed up..."
+
+#=================================================
+# BACKUP THE APP MAIN DIR
+#=================================================
+
+ynh_backup --src_path="$final_path"
+
+#=================================================
+# BACKUP THE NGINX CONFIGURATION
+#=================================================
+
+ynh_backup --src_path="/etc/nginx/conf.d/$domain.d/$app.conf"
+
+#=================================================
+# SPECIFIC BACKUP
+#=================================================
+# BACKUP SYSTEMD
+#=================================================
+
+ynh_backup --src_path="/etc/systemd/system/$app.service"
+
+#=================================================
+# 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/change_url b/scripts/change_url
index 9549643..2a179bf 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -1,3 +1,123 @@
 #!/bin/bash
 
-#TODO
+#=================================================
+# GENERIC STARTING
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+source _common.sh
+source /usr/share/yunohost/helpers
+
+#=================================================
+# RETRIEVE ARGUMENTS
+#=================================================
+
+old_domain=$YNH_APP_OLD_DOMAIN
+old_path=$YNH_APP_OLD_PATH
+
+new_domain=$YNH_APP_NEW_DOMAIN
+new_path=$YNH_APP_NEW_PATH
+
+app=$YNH_APP_INSTANCE_NAME
+
+#=================================================
+# LOAD SETTINGS
+#=================================================
+ynh_script_progression --message="Loading installation settings..." --time --weight=1
+
+# Needed for helper "ynh_add_nginx_config"
+final_path=$(ynh_app_setting_get --app=$app --key=final_path)
+
+#=================================================
+# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
+#=================================================
+ynh_script_progression --message="Backing up the app before changing its url (may take a while)..." --time --weight=1
+
+# Backup the current version of the app
+ynh_backup_before_upgrade
+ynh_clean_setup () {
+	# Remove the new domain config file, the remove script won't do it as it doesn't know yet its location.
+	ynh_secure_remove --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
+
+	# restore it if the upgrade fails
+	ynh_restore_upgradebackup
+}
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
+#=================================================
+# CHECK WHICH PARTS SHOULD BE CHANGED
+#=================================================
+
+change_domain=0
+if [ "$old_domain" != "$new_domain" ]
+then
+	change_domain=1
+fi
+
+change_path=0
+if [ "$old_path" != "$new_path" ]
+then
+	change_path=1
+fi
+
+#=================================================
+# STANDARD MODIFICATIONS
+#=================================================
+# STOP SYSTEMD SERVICE
+#=================================================
+ynh_script_progression --message="Stopping a systemd service..." --time --weight=1
+
+ynh_systemd_action --service_name=$app --action="stop" --log_path="/var/log/$app/$app.log"
+
+#=================================================
+# MODIFY URL IN NGINX CONF
+#=================================================
+ynh_script_progression --message="Updating nginx web server configuration..." --time --weight=1
+
+nginx_conf_path=/etc/nginx/conf.d/$old_domain.d/$app.conf
+
+# Change the path in the nginx config file
+if [ $change_path -eq 1 ]
+then
+	# Make a backup of the original nginx config file if modified
+	ynh_backup_if_checksum_is_different --file="$nginx_conf_path"
+	# Set global variables for nginx helper
+	domain="$old_domain"
+	path_url="$new_path"
+	# Create a dedicated nginx config
+	ynh_add_nginx_config
+fi
+
+# Change the domain for nginx
+if [ $change_domain -eq 1 ]
+then
+	# Delete file checksum for the old conf file location
+	ynh_delete_file_checksum --file="$nginx_conf_path"
+	mv $nginx_conf_path /etc/nginx/conf.d/$new_domain.d/$app.conf
+	# Store file checksum for the new config file location
+	ynh_store_file_checksum --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
+fi
+
+#=================================================
+# GENERIC FINALISATION
+#=================================================
+# START SYSTEMD SERVICE
+#=================================================
+ynh_script_progression --message="Starting a systemd service..." --time --weight=1
+
+ynh_systemd_action --service_name=$app --action="start" --log_path="/var/log/$app/$app.log"
+
+#=================================================
+# RELOAD NGINX
+#=================================================
+ynh_script_progression --message="Reloading nginx web server..." --time --weight=1
+
+ynh_systemd_action --service_name=nginx --action=reload
+
+#=================================================
+# END OF SCRIPT
+#=================================================
+
+ynh_script_progression --message="Change of URL completed for $app" --time --last
diff --git a/scripts/install b/scripts/install
index c0f6ee0..3c41098 100644
--- a/scripts/install
+++ b/scripts/install
@@ -113,6 +113,12 @@ ynh_replace_string --match_string="__EXPIRE__" --replace_string=$expire --target
 
 ynh_add_systemd_config
 
+#=================================================
+# SECURE FILES AND DIRECTORIES
+#=================================================
+
+chown -R $app: $final_path
+
 #=================================================
 # ADVERTISE SERVICE IN ADMIN PANEL
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 9549643..7cdaed6 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -1,3 +1,126 @@
 #!/bin/bash
 
-#TODO
+#=================================================
+# GENERIC START
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+#Keep this path for calling _common.sh inside the execution's context of backup and restore scripts
+source ../settings/scripts/_common.sh
+source /usr/share/yunohost/helpers
+
+#=================================================
+# MANAGE SCRIPT FAILURE
+#=================================================
+
+ynh_clean_setup () {
+	#### Remove this function if there's nothing to clean before calling the remove script.
+	true
+}
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
+#=================================================
+# LOAD SETTINGS
+#=================================================
+ynh_script_progression --message="Loading installation settings..." --time --weight=1
+
+app=$YNH_APP_INSTANCE_NAME
+
+domain=$(ynh_app_setting_get --app=$app --key=domain)
+path_url=$(ynh_app_setting_get --app=$app --key=path)
+final_path=$(ynh_app_setting_get --app=$app --key=final_path)
+db_name=$(ynh_app_setting_get --app=$app --key=db_name)
+db_user=$db_name
+phpversion=$(ynh_app_setting_get --app=$app --key=phpversion)
+
+#=================================================
+# CHECK IF THE APP CAN BE RESTORED
+#=================================================
+ynh_script_progression --message="Validating restoration parameters..." --time --weight=1
+
+ynh_webpath_available --domain=$domain --path_url=$path_url \
+	|| ynh_die --message="Path not available: ${domain}${path_url}"
+test ! -d $final_path \
+	|| ynh_die --message="There is already a directory: $final_path "
+
+#=================================================
+# STANDARD RESTORATION STEPS
+#=================================================
+# RESTORE THE NGINX CONFIGURATION
+#=================================================
+
+ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
+
+#=================================================
+# RESTORE THE APP MAIN DIR
+#=================================================
+ynh_script_progression --message="Restoring the app main directory..." --time --weight=1
+
+ynh_restore_file --origin_path="$final_path"
+
+#=================================================
+# RECREATE THE DEDICATED USER
+#=================================================
+ynh_script_progression --message="Recreating the dedicated system user..." --time --weight=1
+
+# Create the dedicated user (if not existing)
+ynh_system_user_create --username=$app
+
+#=================================================
+# RESTORE USER RIGHTS
+#=================================================
+
+# Restore permissions on app files
+chown -R root: $final_path
+
+#=================================================
+# SPECIFIC RESTORATION
+#=================================================
+# REINSTALL DEPENDENCIES
+#=================================================
+ynh_script_progression --message="Reinstalling dependencies..." --time --weight=1
+
+# Define and install dependencies
+ynh_install_app_dependencies $pkg_dependencies
+
+# Install Nodejs
+ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
+
+#=================================================
+# RESTORE SYSTEMD
+#=================================================
+ynh_script_progression --message="Restoring the systemd configuration..." --time --weight=1
+
+ynh_restore_file --origin_path="/etc/systemd/system/$app.service"
+systemctl enable $app.service
+
+#=================================================
+# INTEGRATE SERVICE IN YUNOHOST
+#=================================================
+ynh_script_progression --message="Integrating service in YunoHost..." --time --weight=1
+
+yunohost service add $app --description "A short description of the app" --log "/var/log/$app/$app.log"
+
+#=================================================
+# START SYSTEMD SERVICE
+#=================================================
+ynh_script_progression --message="Starting a systemd service..." --time --weight=1
+
+ynh_systemd_action --service_name=$app --action="start" --log_path="/var/log/$app/$app.log"
+
+#=================================================
+# GENERIC FINALIZATION
+#=================================================
+# RELOAD NGINX AND PHP-FPM
+#=================================================
+ynh_script_progression --message="Reloading nginx web server..." --time --weight=1
+
+ynh_systemd_action --service_name=nginx --action=reload
+
+#=================================================
+# END OF SCRIPT
+#=================================================
+
+ynh_script_progression --message="Restoration completed for $app" --time --last
diff --git a/scripts/upgrade b/scripts/upgrade
index 9549643..591448a 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,3 +1,184 @@
 #!/bin/bash
 
-#TODO
+#=================================================
+# GENERIC START
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+source _common.sh
+source /usr/share/yunohost/helpers
+
+#=================================================
+# LOAD SETTINGS
+#=================================================
+ynh_script_progression --message="Loading installation settings..." --time --weight=1
+
+app=$YNH_APP_INSTANCE_NAME
+
+domain=$(ynh_app_setting_get --app=$app --key=domain)
+path_url=$(ynh_app_setting_get --app=$app --key=path)
+is_public=$(ynh_app_setting_get --app=$app --key=is_public)
+final_path=$(ynh_app_setting_get --app=$app --key=final_path)
+
+#=================================================
+# CHECK VERSION
+#=================================================
+
+upgrade_type=$(ynh_check_app_version_changed)
+
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+ynh_script_progression --message="Ensuring downward compatibility..." --time --weight=1
+
+# Fix is_public as a boolean value
+if [ "$is_public" = "Yes" ]; then
+	ynh_app_setting_set --app=$app --key=is_public --value=1
+	is_public=1
+elif [ "$is_public" = "No" ]; then
+	ynh_app_setting_set --app=$app --key=is_public --value=0
+	is_public=0
+fi
+
+# If final_path doesn't exist, create it
+if [ -z "$final_path" ]; then
+	final_path=/var/www/$app
+	ynh_app_setting_set --app=$app --key=final_path --value=$final_path
+fi
+
+#=================================================
+# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
+#=================================================
+ynh_script_progression --message="Backing up the app before upgrading (may take a while)..." --time --weight=1
+
+# Backup the current version of the app
+ynh_backup_before_upgrade
+ynh_clean_setup () {
+	# restore it if the upgrade fails
+	ynh_restore_upgradebackup
+}
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
+#=================================================
+# STANDARD UPGRADE STEPS
+#=================================================
+# STOP SYSTEMD SERVICE
+#=================================================
+ynh_script_progression --message="Stopping a systemd service..." --time --weight=1
+
+ynh_systemd_action --service_name=$app --action="stop" --log_path="/var/log/$app/$app.log"
+
+#=================================================
+# DOWNLOAD, CHECK AND UNPACK SOURCE
+#=================================================
+
+if [ "$upgrade_type" == "UPGRADE_APP" ]
+then
+	ynh_script_progression --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"
+fi
+
+#=================================================
+# NGINX CONFIGURATION
+#=================================================
+ynh_script_progression --message="Upgrading nginx web server configuration..." --time --weight=1
+
+# Create a dedicated nginx config
+ynh_add_nginx_config
+
+#=================================================
+# UPGRADE DEPENDENCIES
+#=================================================
+ynh_script_progression --message="Upgrading dependencies..." --time --weight=1
+
+ynh_install_app_dependencies $pkg_dependencies
+
+# Install Nodejs
+ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
+
+#=================================================
+# CREATE DEDICATED USER
+#=================================================
+ynh_script_progression --message="Making sure dedicated system user exists..." --time --weight=1
+
+# Create a dedicated user (if not existing)
+ynh_system_user_create --username=$app
+
+#=================================================
+# INSTALL ETHERCALC
+#=================================================
+ynh_script_progression --message="Building EtherCalc... (this will take some time and resources!)" --weight=240
+
+pushd "$final_path" || ynh_die
+	ynh_use_nodejs
+	ynh_exec_warn_less npm install -g ethercalc
+popd || ynh_die
+
+#=================================================
+# SETUP SYSTEMD
+#=================================================
+ynh_script_progression --message="Upgrading systemd configuration..." --time --weight=1
+
+# Create a dedicated systemd config
+ynh_add_systemd_config
+
+#=================================================
+# MODIFY A CONFIG FILE
+#=================================================
+
+### Verify the checksum of a file, stored by `ynh_store_file_checksum` in the install script.
+### And create a backup of this file if the checksum is different. So the file will be backed up if the admin had modified it.
+ynh_backup_if_checksum_is_different --file="$final_path/CONFIG_FILE"
+
+ynh_replace_string --match_string="match_string" --replace_string="replace_string" --target_file="$final_path/CONFIG_FILE"
+
+# Recalculate and store the checksum of the file for the next upgrade.
+ynh_store_file_checksum --file="$final_path/CONFIG_FILE"
+
+#=================================================
+# GENERIC FINALIZATION
+#=================================================
+# SECURE FILES AND DIRECTORIES
+#=================================================
+
+# Set permissions on app files
+chown -R $app: $final_path
+
+#=================================================
+# INTEGRATE SERVICE IN YUNOHOST
+#=================================================
+ynh_script_progression --message="Integrating service in YunoHost..." --time --weight=1
+
+yunohost service add $app --description "A short description of the app" --log "/var/log/$app/$app.log"
+
+#=================================================
+# START SYSTEMD SERVICE
+#=================================================
+ynh_script_progression --message="Starting a systemd service..." --time --weight=1
+
+ynh_systemd_action --service_name=$app --action="start" --log_path="/var/log/$app/$app.log"
+
+#=================================================
+# UPGRADE FAIL2BAN
+#=================================================
+ynh_script_progression --message="Reconfiguring fail2ban..." --time --weight=1
+
+# Create a dedicated fail2ban config
+ynh_add_fail2ban_config --logpath="/var/log/nginx/${domain}-error.log" --failregex="Regex to match into the log for a failed login"
+
+#=================================================
+# RELOAD NGINX
+#=================================================
+ynh_script_progression --message="Reloading nginx web server..." --time --weight=1
+
+ynh_systemd_action --service_name=nginx --action=reload
+
+#=================================================
+# END OF SCRIPT
+#=================================================
+
+ynh_script_progression --message="Upgrade of $app completed" --time --last