diff --git a/scripts/_common.sh b/scripts/_common.sh
index 7ce131e..dbe6ed5 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -3,7 +3,7 @@
 # COMMON VARIABLES
 #=================================================
 
-pkg_dependencies="php5-gd php5-json php5-intl php5-mcrypt php5-curl php5-apcu php5-redis php5-ldap php5-imagick imagemagick acl tar smbclient"
+pkg_dependencies="php5-gd php5-json php5-intl php5-mcrypt php5-curl php5-apcu php5-redis php5-ldap php5-imagick imagemagick acl tar smbclient postgresql php-pgsql"
 
 if [ "$(lsb_release --codename --short)" != "jessie" ]; then
 	pkg_dependencies="$pkg_dependencies php-zip php-apcu php-mbstring php-xml"
@@ -334,7 +334,7 @@ ynh_multimedia_build_main_dir () {
         local checksum="4852c8607db820ad51f348da0dcf0c88"
 
         # Download yunohost.multimedia scripts
-        wget -nv https://github.com/YunoHost-Apps/yunohost.multimedia/archive/${ynh_media_release}.tar.gz 
+        wget -nv https://github.com/YunoHost-Apps/yunohost.multimedia/archive/${ynh_media_release}.tar.gz
 
         # Verify checksum
         echo "${checksum} ${ynh_media_release}.tar.gz" | md5sum -c --status \
@@ -356,3 +356,158 @@ ynh_multimedia_addaccess () {
         groupadd -f multimedia
         usermod -a -G multimedia $user_name
 }
+
+#=================================================
+# POSTGRESQL HELPERS
+#=================================================
+
+# Create a master password and set up global settings
+# Please always call this script in install and restore scripts
+#
+# usage: ynh_psql_test_if_first_run
+ynh_psql_test_if_first_run() {
+	if [ -f /etc/yunohost/psql ];
+	then
+		echo "PostgreSQL is already installed, no need to create master password"
+	else
+		pgsql=$(ynh_string_random)
+		pg_hba=""
+		echo "$pgsql" >> /etc/yunohost/psql
+
+		if [ -e /etc/postgresql/9.4/ ]
+		then
+			pg_hba=/etc/postgresql/9.4/main/pg_hba.conf
+		elif [ -e /etc/postgresql/9.6/ ]
+		then
+			pg_hba=/etc/postgresql/9.6/main/pg_hba.conf
+		else
+			ynh_die "postgresql shoud be 9.4 or 9.6"
+		fi
+
+		systemctl start postgresql
+		sudo --login --user=postgres psql -c"ALTER user postgres WITH PASSWORD '$pgsql'" postgres
+
+		# force all user to connect to local database using passwords
+		# https://www.postgresql.org/docs/current/static/auth-pg-hba-conf.html#EXAMPLE-PG-HBA.CONF
+		# Note: we can't use peer since YunoHost create users with nologin
+		#  See: https://github.com/YunoHost/yunohost/blob/unstable/data/helpers.d/user
+		sed -i '/local\s*all\s*all\s*peer/i \
+		local all all password' "$pg_hba"
+		systemctl enable postgresql
+		systemctl reload postgresql
+	fi
+}
+
+# Open a connection as a user
+#
+# example: ynh_psql_connect_as 'user' 'pass' <<< "UPDATE ...;"
+# example: ynh_psql_connect_as 'user' 'pass' < /path/to/file.sql
+#
+# usage: ynh_psql_connect_as user pwd [db]
+# | arg: user - the user name to connect as
+# | arg: pwd - the user password
+# | arg: db - the database to connect to
+ynh_psql_connect_as() {
+	user="$1"
+	pwd="$2"
+	db="$3"
+	sudo --login --user=postgres PGUSER="$user" PGPASSWORD="$pwd" psql "$db"
+}
+
+# # Execute a command as root user
+#
+# usage: ynh_psql_execute_as_root sql [db]
+# | arg: sql - the SQL command to execute
+# | arg: db - the database to connect to
+ynh_psql_execute_as_root () {
+	sql="$1"
+	sudo --login --user=postgres psql <<< "$sql"
+}
+
+# Execute a command from a file as root user
+#
+# usage: ynh_psql_execute_file_as_root file [db]
+# | arg: file - the file containing SQL commands
+# | arg: db - the database to connect to
+ynh_psql_execute_file_as_root() {
+	file="$1"
+	db="$2"
+	sudo --login --user=postgres psql "$db" < "$file"
+}
+
+# Create a database, an user and its password. Then store the password in the app's config
+#
+# After executing this helper, the password of the created database will be available in $db_pwd
+# It will also be stored as "psqlpwd" into the app settings.
+#
+# usage: ynh_psql_setup_db user name [pwd]
+# | arg: user - Owner of the database
+# | arg: name - Name of the database
+# | arg: pwd - Password of the database. If not given, a password will be generated
+ynh_psql_setup_db () {
+	db_user="$1"
+	db_name="$2"
+	new_db_pwd=$(ynh_string_random)	# Generate a random password
+	# If $3 is not given, use new_db_pwd instead for db_pwd.
+	db_pwd="${3:-$new_db_pwd}"
+	ynh_psql_create_db "$db_name" "$db_user" "$db_pwd"	# Create the database
+	ynh_app_setting_set "$app" psqlpwd "$db_pwd"	# Store the password in the app's config
+}
+
+# Create a database and grant privilegies to a user
+#
+# usage: ynh_psql_create_db db [user [pwd]]
+# | arg: db - the database name to create
+# | arg: user - the user to grant privilegies
+# | arg: pwd  - the user password
+ynh_psql_create_db() {
+	db="$1"
+	user="$2"
+	pwd="$3"
+	ynh_psql_create_user "$user" "$pwd"
+	sudo --login --user=postgres createdb --owner="$user" "$db"
+}
+
+# Drop a database
+#
+# usage: ynh_psql_drop_db db
+# | arg: db - the database name to drop
+# | arg: user - the user to drop
+ynh_psql_remove_db() {
+	db="$1"
+	user="$2"
+	sudo --login --user=postgres dropdb "$db"
+	ynh_psql_drop_user "$user"
+}
+
+# Dump a database
+#
+# example: ynh_psql_dump_db 'roundcube' > ./dump.sql
+#
+# usage: ynh_psql_dump_db db
+# | arg: db - the database name to dump
+# | ret: the psqldump output
+ynh_psql_dump_db() {
+	db="$1"
+	sudo --login --user=postgres pg_dump "$db"
+}
+
+
+# Create a user
+#
+# usage: ynh_psql_create_user user pwd [host]
+# | arg: user - the user name to create
+ynh_psql_create_user() {
+	user="$1"
+	pwd="$2"
+        sudo --login --user=postgres psql -c"CREATE USER $user WITH PASSWORD '$pwd'" postgres
+}
+
+# Drop a user
+#
+# usage: ynh_psql_drop_user user
+# | arg: user - the user name to drop
+ynh_psql_drop_user() {
+	user="$1"
+	sudo --login --user=postgres dropuser "$user"
+}
diff --git a/scripts/backup b/scripts/backup
index aecf0c0..884ac2f 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -55,10 +55,10 @@ ynh_backup "/etc/php5/fpm/pool.d/$app.conf"
 ynh_backup "/etc/php5/fpm/conf.d/20-$app.ini"
 
 #=================================================
-# BACKUP THE MYSQL DATABASE
+# BACKUP THE POSTGRESQL DATABASE
 #=================================================
 
-ynh_mysql_dump_db "$db_name" > db.sql
+ynh_psql_dump_db "$db_name" > /db.sql
 
 #=================================================
 # SPECIFIC BACKUP
diff --git a/scripts/install b/scripts/install
index 6900ed2..759c52e 100755
--- a/scripts/install
+++ b/scripts/install
@@ -60,12 +60,15 @@ ynh_app_setting_set $app user_home $user_home
 ynh_install_app_dependencies $pkg_dependencies
 
 #=================================================
-# CREATE A MYSQL DATABASE
+# CREATE A POSTGRESQL DATABASE
 #=================================================
 
 db_name=$(ynh_sanitize_dbid $app)
+db_pwd=$(ynh_string_random)
 ynh_app_setting_set $app db_name $db_name
-ynh_mysql_setup_db $db_name $db_name
+ynh_app_setting_set $app db_pwd $db_pwd
+ynh_psql_test_if_first_run
+ynh_psql_create_db $db_name $db_name $db_pwd
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
@@ -134,7 +137,7 @@ chown -R $app: "$final_path" "$datadir"
 
 # Install Nextcloud using a temporary admin user
 exec_occ maintenance:install \
-    --database "mysql" --database-name "$db_name" \
+    --database "pgsql" --database-name "$db_name" \
     --database-user "$db_name" --database-pass "$db_pwd" \
     --admin-user "admin" --admin-pass "$(ynh_string_random 6)" \
     --data-dir "$datadir" \
@@ -204,7 +207,7 @@ exec_occ config:system:get logout_url >/dev/null 2>&1 \
 #=================================================
 
 # Set the user as admin
-ynh_mysql_connect_as "$db_name" "$db_pwd" "$db_name" \
+ynh_psql_connect_as "$db_name" "$db_pwd" "$db_name" \
     <<< "INSERT INTO oc_group_user VALUES ('admin','$admin');"
 # And delete admin user
 exec_occ user:delete admin
diff --git a/scripts/remove b/scripts/remove
index b21d030..fc6f82c 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -29,11 +29,11 @@ final_path=$(ynh_app_setting_get $app final_path)
 ynh_remove_app_dependencies
 
 #=================================================
-# REMOVE THE MYSQL DATABASE
+# REMOVE THE POSTGRESQL DATABASE
 #=================================================
 
 # Remove a database if it exists, along with the associated user
-ynh_mysql_remove_db $db_name $db_name
+ynh_psql_remove_db $db_name $db_name
 
 #=================================================
 # REMOVE APP MAIN DIR
diff --git a/scripts/restore b/scripts/restore
index 44a7f58..6bf31b4 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -33,6 +33,7 @@ domain=$(ynh_app_setting_get $app domain)
 path_url=$(ynh_app_setting_get $app path)
 final_path=$(ynh_app_setting_get $app final_path)
 db_name=$(ynh_app_setting_get $app db_name)
+db_name=$(ynh_app_setting_get $app db_pwd)
 
 #=================================================
 # CHECK IF THE APP CAN BE RESTORED
@@ -58,12 +59,13 @@ ynh_restore_file "/etc/nginx/conf.d/$domain.d/$app.conf"
 ynh_restore_file "$final_path"
 
 #=================================================
-# RESTORE THE MYSQL DATABASE
+# RESTORE THE POSTGRESQL DATABASE
 #=================================================
 
-db_pwd=$(ynh_app_setting_get $app mysqlpwd)
-ynh_mysql_setup_db $db_name $db_name $db_pwd
-ynh_mysql_connect_as $db_name $db_pwd $db_name < ./db.sql
+ynh_psql_test_if_first_run
+ynh_psql_setup_db "$db_name" "$db_name" "$db_pwd"
+# Restore dump
+ynh_psql_execute_file_as_root ./db.sql "$db_name"
 
 #=================================================
 # RECREATE THE DEDICATED USER