diff --git a/scripts/_common.sh b/scripts/_common.sh
index 669e9ba9..04f5ced1 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -10,6 +10,16 @@ php_dependencies="php${YNH_PHP_VERSION}-fpm php${YNH_PHP_VERSION}-bz2 php${YNH_P
 
 pkg_dependencies="imagemagick libmagickcore-6.q16-6-extra acl tar smbclient at $php_dependencies"
 
+
+set_datadir() {
+  if [[ -f $final_path/config/config.php ]]; then
+    datadir=$(grep datadirectory < $final_path/config/config.php | sed "s/.*=>.'\([^']*\)'.*/\1/")
+  else
+    datadir="/home/yunohost.app/$app/data"
+  fi
+}
+
+
 #=================================================
 # EXPERIMENTAL HELPERS
 #=================================================
diff --git a/scripts/backup b/scripts/backup
index 6fd1086a..486c1eac 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -86,6 +86,8 @@ ynh_backup --src_path="/etc/cron.d/$app"
 #=================================================
 ynh_print_info --message="Backing up data directory..."
 
+set_datadir
+
 ynh_backup --src_path="$datadir" --is_big
 
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 42e6dcca..4603c603 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -127,6 +127,8 @@ ynh_restore_file --origin_path="/etc/logrotate.d/$app"
 #=================================================
 ynh_script_progression --message="Restoring data directory..." --weight=2
 
+set_datadir
+
 # Use --not_mandatory for the data directory, because if the backup has been made with BACKUP_CORE_ONLY, there's no data into the backup.
 ynh_restore_file --origin_path="$datadir" --not_mandatory
 
diff --git a/scripts/upgrade b/scripts/upgrade
index eb1adb6f..d965dff2 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -232,8 +232,8 @@ local mount_id=$(exec_occ files_external:create --output=json \
     && ynh_print_warn --message="Unable to create external storage" \
     || exec_occ files_external:option "$mount_id" enable_sharing true
 }
-# Define app's data directory
-datadir="/home/yunohost.app/$app/data"
+# Define app's data directory (defined in _common.sh)
+set_datadir
 
 if [ "$upgrade_type" == "UPGRADE_APP" ]
 then