feat(elastic-metal): add page for rescue data for EM in rescue mode and troubleshoot ssh issues

pages/elastic-metal/troubleshooting/troubleshoot-rescue-your-data.mdx

@@ -0,0 +1,92 @@
+---
+meta:
+  title: How to rescue and recover your data using rescue mode on Elastic Metal
+  description: Learn how to recover and download backups of your data from a Scaleway Elastic Metal server using rescue mode with SFTP
+content:
+  h1: How to rescue and recover your data using rescue mode
+  paragraph: Learn how to recover and download backups of your data from a Scaleway Elastic Metal server using rescue mode with SFTP.
+tags: recovery rescue data rescue-mode
+dates:
+  validation: 2025-04-01
+  posted: 2025-04-01
+categories:
+  - elastic-metal-serrs
+---
+
+If your server encounters issues but does not have a hardware failure, you can still recover your data using rescue mode, regardless of whether you are using Windows or Linux.
+
+<Macro id="requirements" />
+
+- A Scaleway account logged into the [console](https://console.scaleway.com)
+- A [created](/elastic-metal/how-to/create-server/) and [installed](/elastic-metal/how-to/install-server/) Elastic Metal server
+
+## Booting into rescue mode
+
+1. Follow [these instructions](/elastic-metal/how-to/use-rescue-mode/) to start your server in rescue mode (emergency system) via the Scaleway console.
+2. Log into your server using one of the following methods:
+   - [PuTTY](http://the.earth.li/~sgtatham/putty/latest/x86/putty.exe) on [Windows](/elastic-metal/how-to/connect-to-server/#how-to-connect-to-an-elastic-metal-server-from-windows)
+   - `ssh` from a terminal on [Linux or macOS](/elastic-metal/how-to/connect-to-server/#how-to-connect-to-an-elastic-metal-server-from-osx-mac-and-linux).
+
+   <Message type="tip">
+     The rescue mode credentials (username and password) are displayed in your Scaleway console.
+   </Message>
+
+## Gaining root access
+
+By default, you are logged in as a regular user in rescue mode and may not have permission to execute all necessary commands.
+
+1. Switch to the `root` account by typing the following command and pressing Enter:
+    ```bash
+    sudo su
+    ```
+2. Enter the rescue user password displayed in the Scaleway console and press Enter.
+
+   <Message type="tip">
+     For security reasons, the password will not be visible when typing.
+   </Message>
+
+## Mounting partitions
+
+To access your data, you need to mount your server’s partitions in rescue mode. If this step succeeds, you can likely recover your files.
+
+1. As the `root` user, run the following command to mount all partitions:
+    ```bash
+    mountall.sh
+    ```
+   The partitions will be mounted in the `/mnt` directory.
+
+   <Message type="note">
+     You may encounter errors such as `swap cannot be mounted` or `many partitions do not exist`. These can be safely ignored.
+   </Message> 
+
+## Recovering your data
+
+You can recover your data by downloading it directly to your local computer via SFTP.
+
+<Message type="important">
+  Exercise caution when editing your data in rescue mode. The `root` user has full permissions, including the ability to irreversibly delete files.
+</Message>
+
+### Backing up data to your personal computer (via SFTP)
+
+You can use an SFTP client like [FileZilla](https://filezilla-project.org/) to download data from your server.
+
+1. Open FileZilla and fill in the following details:
+    - **Host**: Your server’s IP address
+    - **Username**: Rescue mode username (e.g., `em-XXXX`)
+    - **Password**: Rescue mode password
+    - **Port**: 22
+
+   <Message type="tip">
+     These details are available in your console once rescue mode is active.
+   </Message>
+
+#### Example configuration
+
+<Lightbox src="sftp.webp" />
+
+Your data will be located in the `/mnt`, `/sda1`, or `/sda` directories. You can download it before reinstalling the server or transferring data to another server.
+
+<Message type="tip">
+  If you encounter difficulties, consider contacting a [certified outsourcer](https://www.scaleway.com/en/dedibox/outsourcing/) for professional data recovery.
+</Message>

pages/elastic-metal/troubleshooting/troubleshoot-ssh-issues.mdx

@@ -29,6 +29,7 @@ You are unable to connect to your Scaleway Elastic Metal server via SSH.
 - Incorrect SSH credentials or key configuration.
 - The server is in rescue mode and requires a different login method.
 - A recent security policy change has disabled SSH access.
+- You recently change your SSH keys and it hasn't be added to Elastic Metal system
 
 ## Solution
 
@@ -54,4 +55,9 @@ You are unable to connect to your Scaleway Elastic Metal server via SSH.
 #### Verify the SSH service status
 - Use the remote console from the Scaleway dashboard to access your server.
 - Run `systemctl status ssh` to check if the SSH service is running.
-- If the service is stopped, restart it using `systemctl restart ssh`.
+- If the service is stopped, restart it using `systemctl restart ssh`.
+
+#### Add the new SSH key to the existent system
+- Reboot in rescue mode as explain in this [documentation](/elastic-metal/how-to/use-rescue-mode/)
+- Mount filesystem in rescue mode to access data and files by folowing these [steps](/elastic-metal/troubleshooting/troubleshoot-rescue-your-data/##mounting-partitions)
+- Modify the "authorized_keys" file to add your new SSH public key at the end