diff --git a/config_panel.toml b/config_panel.toml
index 4e458b6..e5e88ae 100644
--- a/config_panel.toml
+++ b/config_panel.toml
@@ -3,14 +3,19 @@ version = "1.0"
 [main]
 name = "Nextcloud configuration"
 
-    [main.maintenance_mode]
-    name = "Maintenance mode"
+    [main.maintenance]
+    name = "Maintenance"
 
-        [main.maintenance_mode.maintenance_mode]
+        [main.maintenance.maintenance_mode]
         ask = "Enable maintenance mode"
         type = "boolean"
         default = "0"
 
+        [main.maintenance.set_permissions_button]
+        ask.en = "Set permissions for all data (Can take up to several hours if users have a lot of data)"
+        type = "button"
+        style = "success"
+
     [main.addressbook]
     name = "Address book configuration"
 
diff --git a/scripts/config b/scripts/config
index 93ced20..e231009 100644
--- a/scripts/config
+++ b/scripts/config
@@ -105,6 +105,24 @@ set__fpm_free_footprint() {
     fi
 }
 
+#=================================================
+# SPECIFIC RUNNERS FOR TOML SHORT KEYS
+#=================================================
+
+function run__set_permissions_button() {
+    local data_dir=$(ynh_app_setting_get --app=$app --key=data_dir)
+    ynh_print_info "Set permissions, it may take some time..."
+    chown -R $app:www-data "$install_dir"
+    chown -R $app: "$data_dir"
+    find $install_dir/ -type f -print0 | xargs -r0 chmod 0644
+    find $install_dir/ -type d -print0 | xargs -r0 chmod 0755
+    find $data_dir/data/ -type f -print0 | xargs -r0 chmod 0640
+    find $data_dir/data/ -type d -print0 | xargs -r0 chmod 0750
+    chmod 640 "$install_dir/config/config.php"
+    chmod 755 /home/yunohost.app
+    chmod 750 $install_dir
+}
+
 #=================================================
 # GENERIC FINALIZATION
 #=================================================
diff --git a/scripts/install b/scripts/install
index 88c1c0d..0987b84 100755
--- a/scripts/install
+++ b/scripts/install
@@ -64,7 +64,8 @@ exec_occ() {
 }
 
 # Set write access for the following commands
-chown -R $app: "$install_dir" "$data_dir"
+chown -R $app:www-data "$install_dir"
+chown -R $app: "$data_dir"
 
 # Define password in an intermediate var
 # The fact that it's called _password allows it to be
@@ -240,7 +241,7 @@ find $install_dir/ -type f -print0 | xargs -r0 chmod 0644
 find $install_dir/ -type d -print0 | xargs -r0 chmod 0755
 find $data_dir/data/ -type f -print0 | xargs -r0 chmod 0640
 find $data_dir/data/ -type d -print0 | xargs -r0 chmod 0750
-chmod 640 "$install_dir/config/config.php"
+chmod 600 "$install_dir/config/config.php"
 chmod 755 /home/yunohost.app
 chmod 750 $install_dir
 
diff --git a/scripts/restore b/scripts/restore
index 1b0f63c..9ae3611 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -85,7 +85,7 @@ find $install_dir/ -type f -print0 | xargs -r0 chmod 0644
 find $install_dir/ -type d -print0 | xargs -r0 chmod 0755
 find $data_dir/data/ -type f -print0 | xargs -r0 chmod 0640
 find $data_dir/data/ -type d -print0 | xargs -r0 chmod 0750
-chmod 640 "$install_dir/config/config.php"
+chmod 600 "$install_dir/config/config.php"
 chmod 755 /home/yunohost.app
 chmod 750 $install_dir
 
diff --git a/scripts/upgrade b/scripts/upgrade
index ad0e4c6..c4b764c 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -138,7 +138,7 @@ then
     ynh_script_progression --message="Upgrading $app..." --weight=3
 
     # Set write access for the following commands
-    chown -R $app: "$install_dir" "$data_dir"
+    chown -R $app:www-data "$install_dir"
 
     # Print the current version number of Nextcloud
     exec_occ -V
@@ -207,7 +207,7 @@ then
         mv "$tmpdir" "$install_dir"
 
         # Set write access for the following commands
-        chown -R $app: "$install_dir" "$data_dir"
+        chown -R $app:www-data "$install_dir"
 
         # Upgrade Nextcloud (SUCCESS = 0, UP_TO_DATE = 3)
         exec_occ maintenance:mode --off
@@ -325,12 +325,9 @@ ynh_script_progression --message="Reapplying file permissions..." --weight=2
 
 # Fix app ownerships & permissions
 chown -R $app:www-data "$install_dir"
-chown -R $app: "$data_dir"
 find $install_dir/ -type f -print0 | xargs -r0 chmod 0644
 find $install_dir/ -type d -print0 | xargs -r0 chmod 0755
-find $data_dir/data/ -type f -print0 | xargs -r0 chmod 0640
-find $data_dir/data/ -type d -print0 | xargs -r0 chmod 0750
-chmod 640 "$install_dir/config/config.php"
+chmod 600 "$install_dir/config/config.php"
 chmod 755 /home/yunohost.app
 chmod 750 $install_dir