diff --git a/conf/default.yml b/conf/default.yml
index bf55dca..50f8d70 100644
--- a/conf/default.yml
+++ b/conf/default.yml
@@ -80,7 +80,7 @@ redis:
   port: 6379
   #pass: example-pass
   #prefix: example-prefix
-  #db: 1
+  db: __REDIS_DB__
 
 #   ┌─────────────────────────────┐
 #───┘ Elasticsearch configuration └─────────────────────────────
diff --git a/conf/systemd.service b/conf/systemd.service
index 9540e71..465a25c 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -12,5 +12,35 @@ ExecStart=__YNH_NPM__ start
 TimeoutSec=60
 Restart=always
 
+# Sandboxing options to harden security
+# Depending on specificities of your service/app, you may need to tweak these 
+# .. but this should be a good baseline
+# Details for these options: https://www.freedesktop.org/software/systemd/man/systemd.exec.html
+NoNewPrivileges=yes
+PrivateTmp=yes
+PrivateDevices=yes
+RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6
+RestrictNamespaces=yes
+RestrictRealtime=yes
+DevicePolicy=closed
+ProtectSystem=full
+ProtectControlGroups=yes
+ProtectKernelModules=yes
+ProtectKernelTunables=yes
+LockPersonality=yes
+SystemCallFilter=~@clock @debug @module @mount @obsolete @reboot @setuid @swap
+
+# Denying access to capabilities that should not be relevant for webapps
+# Doc: https://man7.org/linux/man-pages/man7/capabilities.7.html
+CapabilityBoundingSet=~CAP_RAWIO CAP_MKNOD
+CapabilityBoundingSet=~CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_AUDIT_WRITE
+CapabilityBoundingSet=~CAP_SYS_BOOT CAP_SYS_TIME CAP_SYS_MODULE CAP_SYS_PACCT
+CapabilityBoundingSet=~CAP_LEASE CAP_LINUX_IMMUTABLE CAP_IPC_LOCK
+CapabilityBoundingSet=~CAP_BLOCK_SUSPEND CAP_WAKE_ALARM
+CapabilityBoundingSet=~CAP_SYS_TTY_CONFIG
+CapabilityBoundingSet=~CAP_MAC_ADMIN CAP_MAC_OVERRIDE
+CapabilityBoundingSet=~CAP_NET_ADMIN CAP_NET_BROADCAST CAP_NET_RAW
+CapabilityBoundingSet=~CAP_SYS_ADMIN CAP_SYS_PTRACE CAP_SYSLOG 
+
 [Install]
 WantedBy=multi-user.target
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 5745215..79d2d82 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -7,9 +7,9 @@
 MEMORY_NEEDED="2560"
 
 # dependencies used by the app
-pkg_dependencies="build-essential ffmpeg redis-server redis-tools postgresql postgresql-contrib"
+pkg_dependencies="build-essential ffmpeg redis-server postgresql postgresql-contrib"
 
-NODEJS_VERSION="12"
+NODEJS_VERSION="14"
 
 #=================================================
 # PERSONAL HELPERS
@@ -114,3 +114,43 @@ ynh_is_main_device_a_sd_card () {
 		return 1
 	fi
 }
+
+
+# get the first available redis database
+#
+# usage: ynh_redis_get_free_db
+# | returns: the database number to use
+ynh_redis_get_free_db() {
+	local result max db
+	result=$(redis-cli INFO keyspace)
+
+	# get the num
+	max=$(cat /etc/redis/redis.conf | grep ^databases | grep -Eow "[0-9]+")
+
+	db=0
+	# default Debian setting is 15 databases
+	for i in $(seq 0 "$max")
+	do
+	 	if ! echo "$result" | grep -q "db$i"
+	 	then
+			db=$i
+	 		break 1
+ 		fi
+ 		db=-1
+	done
+
+	test "$db" -eq -1 && ynh_die --message="No available Redis databases..."
+
+	echo "$db"
+}
+
+# Create a master password and set up global settings
+# Please always call this script in install and restore scripts
+#
+# usage: ynh_redis_remove_db database
+# | arg: database - the database to erase
+ynh_redis_remove_db() {
+	local db=$1
+	redis-cli -n "$db" flushall
+}
+
diff --git a/scripts/install b/scripts/install
index 78fa0ed..24fbedc 100755
--- a/scripts/install
+++ b/scripts/install
@@ -69,7 +69,6 @@ ynh_install_nodejs --nodejs_version=$NODEJS_VERSION
 
 ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 
-curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - 
 ynh_install_extra_app_dependencies --repo="deb https://dl.yarnpkg.com/debian/ stable main" --package="yarn" --key="https://dl.yarnpkg.com/debian/pubkey.gpg"
 
 #=================================================
@@ -89,7 +88,7 @@ ynh_psql_setup_db --db_user=$db_name --db_name=$db_name
 ynh_script_progression --message="Configuring system user..." --weight=2
 
 # Create a system user
-ynh_system_user_create --username=$app
+ynh_system_user_create --username=$app --home_dir="$final_path"
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
@@ -100,6 +99,10 @@ ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 # Download, check integrity, uncompress and patch the source from app.src
 ynh_setup_source --dest_dir="$final_path"
 
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
+
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
@@ -119,9 +122,17 @@ ynh_add_systemd_config
 #=================================================
 # STORE THE CONFIG FILE CHECKSUM
 #=================================================
+ynh_script_progression --message="Adding a configuration file..." --weight=1
+
+# Configure redis
+redis_db=$(ynh_redis_get_free_db)
+ynh_app_setting_set --app="$app" --key=redis_db --value="$redis_db"
 
 ynh_add_config --template="../conf/default.yml" --destination="$final_path/.config/default.yml"
 
+chmod 400 "$final_path/.config/default.yml"
+chown $app:$app "$final_path/.config/default.yml"
+
 #=================================================
 # INSTALLING MISKKEY
 #=================================================
@@ -133,15 +144,6 @@ pushd "$final_path"
 	ynh_exec_warn_less yarn run init
 popd
 
-#=================================================
-# GENERIC FINALIZATION
-#=================================================
-# SECURE FILES AND DIRECTORIES
-#=================================================
-
-# Set permissions to app files
-chown -R $app: $final_path
-
 #=================================================
 # INTEGRATE SERVICE IN YUNOHOST
 #=================================================
diff --git a/scripts/remove b/scripts/remove
index dcac200..f5c76c2 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -21,6 +21,7 @@ port=$(ynh_app_setting_get --app=$app --key=port)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 db_user=$db_name
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
+redis_db=$(ynh_app_setting_get --app=$app --key=redis_db)
 
 #=================================================
 # STANDARD REMOVE
@@ -51,6 +52,13 @@ ynh_script_progression --message="Removing the PostgreSQL database..." --weight=
 # Remove a database if it exists, along with the associated user
 ynh_psql_remove_db --db_user="$db_user" --db_name="$db_name"
 
+#=================================================
+# REMOVE THE REDIS DATABASE
+#=================================================
+ynh_script_progression --message="Removing the Redis database..." --weight=1
+
+ynh_redis_remove_db "$redis_db"
+
 #=================================================
 # REMOVE DEPENDENCIES
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 8c790e1..154f18b 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -40,8 +40,6 @@ db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd)
 #=================================================
 ynh_script_progression --message="Validating restoration parameters..." --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 "
 
@@ -52,13 +50,6 @@ test ! -d $final_path \
 
 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..." --weight=1
-
-ynh_restore_file --origin_path="$final_path"
-
 #=================================================
 # RECREATE THE DEDICATED USER
 #=================================================
@@ -68,11 +59,15 @@ ynh_script_progression --message="Recreating the dedicated system user..." --wei
 ynh_system_user_create --username=$app --home_dir="$final_path"
 
 #=================================================
-# RESTORE USER RIGHTS
+# RESTORE THE APP MAIN DIR
 #=================================================
+ynh_script_progression --message="Restoring the app main directory..." --weight=1
 
-# Restore permissions on app files
-chown -R $app: $final_path
+ynh_restore_file --origin_path="$final_path"
+
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
 
 #=================================================
 # SPECIFIC RESTORATION
diff --git a/scripts/upgrade b/scripts/upgrade
index 81932fe..c178061 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -82,7 +82,7 @@ ynh_systemd_action --service_name=$app --action=stop --log_path=systemd --line_m
 ynh_script_progression --message="Making sure dedicated system user exists..." --weight=1
 
 # Create a dedicated user (if not existing)
-ynh_system_user_create --username=$app
+ynh_system_user_create --username=$app --home_dir="$final_path"
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
@@ -96,6 +96,10 @@ then
 	ynh_setup_source --dest_dir="$final_path" --keep="$final_path/.config/default.yml"
 fi
 
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:www-data "$final_path"
+
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
@@ -113,7 +117,6 @@ ynh_install_nodejs --nodejs_version=$NODEJS_VERSION
 
 ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 
-curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - 
 ynh_install_extra_app_dependencies --repo="deb https://dl.yarnpkg.com/debian/ stable main" --package="yarn" --key="https://dl.yarnpkg.com/debian/pubkey.gpg"
 
 #=================================================
@@ -134,15 +137,6 @@ ynh_script_progression --message="Upgrading systemd configuration..." --weight=1
 # Create a dedicated systemd config
 ynh_add_systemd_config
 
-#=================================================
-# GENERIC FINALIZATION
-#=================================================
-# SECURE FILES AND DIRECTORIES
-#=================================================
-
-# Set permissions on app files
-chown -R $app: $final_path
-
 #=================================================
 # INTEGRATE SERVICE IN YUNOHOST
 #=================================================