Update page 'This guide should help new users to secure "harden" their Oxen Service Node.'

This-guide-should-help-new-users-to-secure-%22harden%22-their-Oxen-Service-Node..md

@@ -612,6 +612,28 @@ sudo reboot
 
 # 8. Backup securely all keys, passwords and passphrases !
 
+Beside the backup of all your passwords and ssh key you should also backup your oxen service node key.
+
+
+```
+sudo oxen-sn-keys show /var/lib/loki/key_ed25519
+```
+
+Copy secret key into a safe place!
+
+Restore key:
+Rename existing ed25519-key before restoring: 
+
+```
+sudo mv /var/lib/loki/key_ed25519 /var/lib/loki/key_ed25519.old
+```
+
+```
+sudo oxen-sn-keys restore /var/lib/loki/key_ed25519
+```
+
+Give the secret key when asked.
+
 # 9. Express Guide (not ready yet)
 
 **VPS login**