diff --git a/scripts/backup b/scripts/backup
index d621689..610ad7e 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -28,10 +28,6 @@ final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 domain=$(ynh_app_setting_get --app=$app --key=domain)
 datadir=$(ynh_app_setting_get --app=$app --key=datadir)
 
-# other variables
-media_dir="/home/yunohost.multimedia/share/Music"
-cmd_file="/usr/local/bin/mopidyctl"
-
 #=================================================
 # DECLARE DATA AND CONF FILES TO BACKUP
 #=================================================
@@ -47,7 +43,7 @@ ynh_backup --src_path="$final_path"
 # BACKUP THE DATA DIR
 #=================================================
 
-ynh_backup --src_path="$datadir"
+ynh_backup --src_path="$datadir" --is_big
 
 #=================================================
 # BACKUP THE NGINX CONFIGURATION
@@ -67,7 +63,7 @@ ynh_backup --src_path="/etc/systemd/system/$app.service"
 # BACKUP VARIOUS FILES
 #=================================================
 
-ynh_backup --src_path="$cmd_file"
+ynh_backup --src_path="/usr/local/bin/mopidyctl"
 
 #=================================================
 # END OF SCRIPT
diff --git a/scripts/install b/scripts/install
index 350ec9a..a543c58 100755
--- a/scripts/install
+++ b/scripts/install
@@ -61,15 +61,15 @@ port=$(ynh_find_port --port=6680)
 ynh_app_setting_set --app=$app --key=port --value=$port
 
 if [ $mpd_port -eq 1 ]; then
-	mpd_port=$(ynh_find_port --port=6600)
+	mpd_port=6600
+	ynh_app_setting_set --app=$app --key=mpd_port --value=$mpd_port
+	ynh_port_available --port=$mpd_port || ynh_die --message="Port $mpd_port is needs to be available for this app"
 	ynh_exec_warn_less yunohost firewall allow --no-upnp TCP $mpd_port
 	mpd_state="true"
 else
 	mpd_state="false"
 fi
 
-ynh_app_setting_set --app=$app --key=mpd_port --value=$mpd_port
-
 #=================================================
 # INSTALL DEPENDENCIES
 #=================================================
@@ -109,9 +109,11 @@ ynh_add_nginx_config
 #=================================================
 # SPECIFIC SETUP
 #=================================================
-# ...
+# BUILD MULTIMEDIA
 #=================================================
+ynh_script_progression --message="Building multimedia directory..."
 
+media_dir="/home/yunohost.multimedia/share/Music"
 ynh_multimedia_build_main_dir      # /home/yunohost.multimedia
 
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index bc6e61e..455ad05 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -29,10 +29,6 @@ path_url=$(ynh_app_setting_get --app=$app --key=path)
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 mpd_port=$(ynh_app_setting_get --app=$app --key=mpd_port)
 
-# other variables
-media_dir="/home/yunohost.multimedia/share/Music"
-cmd_file="/usr/local/bin/mopidyctl"
-
 #=================================================
 # CHECK IF THE APP CAN BE RESTORED
 #=================================================
@@ -106,7 +102,7 @@ fi
 #=================================================
 ynh_script_progression --message="Restoring various files..."
 
-ynh_restore_file --origin_path="$cmd_file"     # /usr/local/bin/mopidyctl
+ynh_restore_file --origin_path="/usr/local/bin/mopidyctl"     # /usr/local/bin/mopidyctl
 
 #=================================================
 # RESTORE SYSTEMD
diff --git a/scripts/upgrade b/scripts/upgrade
index 4dc486a..bb00cdb 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -118,6 +118,7 @@ ynh_add_nginx_config
 #=================================================
 ynh_script_progression --message="Updating a configuration file..."
 
+media_dir="/home/yunohost.multimedia/share/Music"
 ynh_add_config --template="../conf/app.conf" --destination="$final_path/$app.conf"
 
 chmod 400 "$final_path/some_config_file"