Update page 'Home'

Home.md

@@ -46,6 +46,8 @@ Copy and/or git clone any third party plugins into ``plugins.local`` as usual.
 
 A common pattern is shared nginx doing SSL termination, etc.
 
+Nginx:
+
 ```nginx
    location /tt-rss/ {
       proxy_set_header Host $host;
@@ -85,6 +87,20 @@ You will need to set ``SELF_URL_PATH`` to a correct (i.e. visible from the outsi
 - You can use nginx frontend instead of Caddy by uncommenting ``web-nginx`` container in ``docker-compose.yml``.
 - Alternatively, replace web container source image with ``jessestuart/caddy`` (note that it has telemetry enabled).
 
+### Backing up the database
+
+You can use something like this:
+
+```sh
+source .env
+docker-compose exec db /bin/bash \
+  -c "export PGPASSWORD=$POSTGRES_PASSWORD \
+  && pg_dump -U $POSTGRES_USER $POSTGRES_USER" \
+  | gzip -9 > backup.sql.gz
+```
+
+(https://community.tt-rss.org/t/docker-compose-tt-rss/2894/233?u=fox)
+
 ## TODO
 
 See [TODO](wiki/TODO).