diff --git a/backup.sh b/backup.sh
new file mode 100755
index 0000000..3080970
--- /dev/null
+++ b/backup.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+bak=/home/minetest/nalc-server-0.4/backup
+if [[ ! -d $bak ]]; then
+	 mkdir $bak
+fi
+
+bak_tmp=/var/tmp/nalc-0.4_dump
+if [[ ! -d $bak_tmp ]]; then
+	 mkdir $bak_tmp
+fi
+
+rm -r /home/minetest/nalc-server-0.4/minetest/worlds/nalc/rollback.sqlite
+tar -I pbzip2 -cvf $bak/world.tar.bz2 /home/minetest/nalc-server-0.4/minetest/worlds/nalc
+
+pg_dump nalc-0.4 > $bak_tmp/nalc-0.4.sql
+pg_dump players-nalc-0.4 > $bak_tmp/players-nalc-0.4.sql
+
+if [[ -e $bak/dump_sql.tar.bz2 ]]; then
+	 cd $bak
+	 tar -jxvf dump_sql.tar.bz2
+	 cd ..
+fi
+
+rdiff-backup --no-file-statistics $bak_tmp $bak
+
+cd $bak
+tar -I pbzip2 -cvf dump_sql.tar.bz2 --remove-files *.sql
+cd ..
+
+rm -rf $bak_tmp
diff --git a/install.sh b/install.sh
index 4cc2dda..cf1e175 100755
--- a/install.sh
+++ b/install.sh
@@ -25,9 +25,9 @@ usage() {
     echo "--makeopt | -j : Passer des options à make."
     echo "--ssh <user@host>: Identifiants ssh."
     echo "--url <URL>: URL distante personnalisée."
+	 echo -e "\tSi l'option --ssh est passée en option, il s'agira du chemin distant."
 	 echo "--irrlicht | -i : Chemin personnalisé des sources irrlicht."
 	 echo "--postgresql | -p : Si vous voulez que le serveur soit configuré avec postgresql"
-    echo -e "\tSi l'option --ssh est passée en option, il s'agira du chemin distant."
     echo "Commandes :"
     echo -e "\t0.5 : Installation du serveur avec minetest-0.5.x. Suivez les instructions..."
     echo -e "\t0.4 : Installation du serveur avec minetest-0.4.x. Suivez les instructions..."
@@ -67,11 +67,11 @@ postgresql() {
 	 read -p "Indiquez le mot de passe : " pg_password
 	 read -p "Indiquez le nom de la BDD à utiliser : " pg_dbname
 
-	 echo "gameid = minetest_game" > worldmt.conf
-	 echo "backend = postgresql" >> worldmt.conf
-	 echo "player_backend = postgresql" >> worldmt.conf
-	 echo "pgsql_connection = host=$pg_url user=$pg_user password=$pg_password dbname=$pg_dbname" >> worldmt.conf
-	 echo "pgsql_player_connection = host=$pg_url user=$pg_user password=$pg_password dbname=players-$pg_dbname" >> worldmt.conf
+	 echo "gameid = minetest_game" > world.mt
+	 echo "backend = postgresql" >> world.mt
+	 echo "player_backend = postgresql" >> world.mt
+	 echo "pgsql_connection = host=$pg_url user=$pg_user password=$pg_password dbname=$pg_dbname" >> world.mt
+	 echo "pgsql_player_connection = host=$pg_url user=$pg_user password=$pg_password dbname=players-$pg_dbname" >> world.mt
 }
 
 install_0.4() {
@@ -181,7 +181,7 @@ install_minetest_game() {
 
 	 if [[ ! -d minetest_game ]]; then
 		  local branch="-b master"
-		  if [[ ! $ver == "0.4" ]]; then
+		  if [[ $ver == "0.4" ]]; then
 				branch="-b backport-0.4"
 		  fi
 		  git clone $branch $URL/minetest_game.git
@@ -226,11 +226,7 @@ install_world() {
 				createdb players-$pg_dbname
 		  fi
 
-		  if [[ $ver == "0.4" ]]; then
-				ln -s $(pwd)/server-0.4/worlds/minetestforfun/world.mt minetest/worlds/nalc/world.mt
-		  else
-				ln -s $(pwd)/world.mt minetest/worlds/nalc/world.mt
-		  fi
+		  ln -s $(pwd)/world.mt minetest/worlds/nalc/world.mt
 	 fi
 }		
 
@@ -238,7 +234,7 @@ install_mods() {
 	 if [[ $ver == "0.4" ]]; then
 		  local i=0
 		  local md[1]="" # Mods to disable
-		  for mod in "mysql_auth watershed mobs_old magicmithril obsidian eventobjects player_inactive random_messages irc irc_commands profilerdumper profnsched"; do
+		  for mod in mysql_auth watershed mobs_old magicmithril obsidian eventobjects player_inactive random_messages irc irc_commands profilerdumper profnsched; do
 				i=$(( $i+1 ))
 				md[$i]=$mod
 		  done
@@ -248,17 +244,17 @@ install_mods() {
 				ln -s $(pwd)/server-0.4/mods minetest/mods
 		  fi
 
-		  if [[ -a world.mt ]]; then
+		  if [[ -a world.mt && -z $pg_dbname ]]; then
 				rm world.mt
+				cp worldmt.conf world.mt
 		  fi
-		  cp worldmt.conf world.mt
-
+		  
 		  ls server-0.4/mods | while read -r mod; do
 				if [[ -a server-0.4/mods/$mod/modpack.txt ]]; then
 					 ls server-0.4/mods/$mod | while read -r submod; do
 						  if [[ -d server-0.4/mods/$mod/$submod ]]; then
 								local mod_enable="true"
-								for (( modn=1; modn<$i; modn++ )); do
+								for (( modn=1; modn<=$i; modn++ )); do
 									 if [[ ${md[$modn]} == $submod ]]; then
 										  mod_enable="false"
 									 fi
@@ -268,7 +264,7 @@ install_mods() {
 					 done
 				else
 					 local mod_enable="true"
-					 for (( modn=1; modn<$i; modn++ )); do
+					 for (( modn=1; modn<=$i; modn++ )); do
 						  if [[ ${md[$modn]} == $mod ]]; then
 								mod_enable="false"
 						  fi
@@ -306,12 +302,11 @@ install_mods() {
 		  # Recréation des liens symboliques et du fichier world.mt (dans tous les cas)
 		  rm minetest/mods/*
 		  
-		  if [[ -a world.mt ]]; then
+		  if [[ -a world.mt && -z $pg_dbname ]]; then
 				rm world.mt
+				cp worldmt.conf world.mt
 		  fi
 		  
-		  cp worldmt.conf world.mt
-		  
 		  if [[ -d custom/mods ]]; then
 				ls custom/mods | while read -r mod; do
 					 if [[ -d custom/mods/$mod ]]; then