Add backup and upgrade guides for self-hosted deployments (#105)

Co-authored-by: braginini <bangvalo@gmail.com>

src/pages/selfhosted/selfhosted-quickstart.mdx

@@ -55,11 +55,39 @@ bash getting-started-with-zitadel.sh
 </Note>
 Once the script execution is complete, you can access your netbird instance via the URL `https://netbird.example.com` using the credentials displayed in your terminal.
 
-### Creating users
+### Add users
 If you want to add additional users, you can access Zitadel's management console via the URL `https://netbird.example.com/ui/console` with the same credentials. Follow the [Users guide](https://zitadel.com/docs/guides/manage/console/users)
 from Zitadel to add additional local users or integrate Zitadel with your existing identity provider by following the guide [Configure identity providers](https://zitadel.com/docs/guides/integrate/identity-providers).
 
-### Remove NetBird
+### Backup
+To backup your NetBird installation, you need to copy the configuration files, the Management service databases, and Zitadel's database.
+
+The configuration files are located in the folder where you ran the installation script. To backup, copy the files to a backup location:
+```bash
+mkdir backup
+cp docker-compose.yml Caddyfile zitadel.env dashboard.env turnserver.conf management.json backup/
+```
+To save the Management service databases, you need to stop the Management service and copy the files from the store directory using a docker compose command as follows:
+```bash
+docker compose stop management
+docker compose cp -a management:/var/lib/netbird/ backup/
+docker compose start management
+```
+You can follow the [Cockroach backup guide](https://www.cockroachlabs.com/docs/stable/backup) to backup Zitadel's database, which holds user information.
+
+### Upgrade
+To upgrade NetBird to the latest version, you need to review the [release notes](https://github.com/netbirdio/netbird/releases) for any breaking changes and follow the upgrade steps below:
+1. Run the backup steps described in the [backup](#backup) section.
+2. Pull the latest NetBird docker images:
+    ```bash
+    docker compose pull management dashboard signal
+    ```
+3. Restart the NetBird containers with the new images:
+    ```bash
+    docker compose up -d --force-recreate management dashboard signal
+    ```
+
+### Remove
 To remove the NetBird installation and all related data from your server, run these commands from the folder where you installed NetBird:
 ```bash
 # remove all NetBird-related containers and volumes (data)
@@ -68,9 +96,17 @@ docker compose down --volumes
 rm -f docker-compose.yml Caddyfile zitadel.env dashboard.env machinekey/zitadel-admin-sa.token turnserver.conf management.json
 ```
 
-### Troubleshooting
+### Troubleshoot
 
 - I'm trying to register a user but I didn't receive a verification code. Whats is the problem?
 
     The NetBird quickstart script generates a user name and a password for the administrator. This should be enough to login and manage your network.
-    If you want to register a new user and invite them via email, you need to configure a SMTP server in Zitadel. See [this guide](https://zitadel.com/docs/guides/manage/console/instance-settings#smtp) or details.
+    If you want to register a new user and invite them via email, you need to configure a SMTP server in Zitadel. See [this guide](https://zitadel.com/docs/guides/manage/console/instance-settings#smtp) or details.
+
+## Get in touch
+
+Feel free to ping us on [Slack](https://join.slack.com/t/netbirdio/shared_invite/zt-vrahf41g-ik1v7fV8du6t0RwxSrJ96A) if you have any questions
+
+- NetBird managed version: [https://app.netbird.io](https://app.netbird.io)
+- Make sure to [star us on GitHub](https://github.com/netbirdio/netbird)
+- Follow us [on Twitter](https://twitter.com/netbird)