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Merge pull request #2133 from nextcloud/enh/readme/persist-volumes-custom-upgrade-exclude 

enh(README) Persistent volume upgrade.exclude clarification
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@ -71,6 +71,8 @@ $ docker run -d \
mariadb:10.6
```
### Additional volumes
If you want to get fine grained access to your individual files, you can mount additional volumes for data, config, your theme and custom apps. The `data`, `config` files are stored in respective subfolders inside `/var/www/html/`. The apps are split into core `apps` (which are shipped with Nextcloud and you don't need to take care of) and a `custom_apps` folder. If you use a custom theme it would go into the `themes` subfolder.
Overview of the folders that can be mounted as volumes:
@ -91,10 +93,16 @@ $ docker run -d \
-v theme:/var/www/html/themes/<YOUR_CUSTOM_THEME> \
nextcloud
```
If mounting additional volumes, you should note that data inside the main folder (`/var/www/html`) may be removed during installation and upgrades, unless listed in [upgrade.exclude](https://github.com/nextcloud/docker/blob/master/upgrade.exclude). You should consider:
### Custom volumes
If mounting additional volumes under `/var/www/html`, you should consider:
- Confirming that [upgrade.exclude](https://github.com/nextcloud/docker/blob/master/upgrade.exclude) contains the files and folders that should persist during installation and upgrades; or
- Mounting storage volumes to locations outside of `/var/www/html`.
> [!WARNING]
> You should note that data inside the main folder (`/var/www/html`) will be overridden/removed during installation and upgrades, unless listed in [upgrade.exclude](https://github.com/nextcloud/docker/blob/master/upgrade.exclude). The additional volumes officially supported are already in that list, but custom volumes will need to be added by you. We suggest mounting custom storage volumes outside of `/var/www/html` and if possible read-only so that making this adjustment is unnecessary. If you must do so, however, you may build a custom image with a modified `/upgrade.exclude` file that incorporates your custom volume(s).
## Using the Nextcloud command-line interface
To use the [Nextcloud command-line interface](https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/occ_command.html) (aka. `occ` command):