Updated Troubleshooting (markdown)

Troubleshooting.md

@@ -44,7 +44,7 @@ Enter the Netbox shell, e.g. to get access to `./manage.py`:
 docker-compose exec netbox /bin/bash
 ```
 
-### Database operations
+### Database Operations
 
 Access the database:
 
@@ -64,6 +64,22 @@ Restore that database:
 gunzip -c db_dump.sql.gz | docker exec -i $(docker-compose ps -q postgres) sh -c 'psql -U $POSTGRES_USER $POSTGRES_DB'
 ```
 
+### File Operations
+
+Backup of the _media_ directory, which contains uploaded images.
+
+```bash
+docker-compose exec netbox tar c -jf - -C /opt/netbox/netbox/media ./ > media-backup.tar.bz2
+```
+
+Restore of the _media_ directory:
+
+> ⚠️ This may overwrite files in the media directory!
+
+```bash
+docker-compose exec -T netbox tar x -jvf - -C /opt/netbox/netbox/media < media-backup.tar.bz2 
+```
+
 ### Nginx doesn't start
 
 As a first step, stop your docker-compose setup.