more README renaming

docker/graduated/nextcloud/nextcloud-aio.md

@@ -6,6 +6,7 @@
     - [IPV6](#ipv6)
     - [Install](#install)
   - [Backups](#backups)
+  - [Maintenace Mode](#maintenace-mode)
   - [Trusted Proxy](#trusted-proxy)
   - [Default phone region](#default-phone-region)
   - [Adding existing files](#adding-existing-files)
@@ -89,6 +90,16 @@ Write down the passphrase. Store both at safe place(s).
 docker exec nextcloud-aio-borgbackup borg key export /mnt/borgbackup/borg/
 ```
 
+## Maintenace Mode
+
+```bash
+docker stop nextcloud-aio-apache
+docker exec -it -u www-data nextcloud-aio-nextcloud ./occ maintenance:mode --on
+
+docker start nextcloud-aio-apache
+docker exec -it -u www-data nextcloud-aio-nextcloud ./occ maintenance:mode --off
+```
+
 ## Trusted Proxy
 
 If running with a reverse proxy.