docs(readme): add DB backup & restore instructions

README.md

@@ -2,10 +2,22 @@
 
 Infrastructure for base server
 
-**Important note**
-
-For postgreSQL multiple databases scripts:
+#### For postgreSQL multiple databases scripts:
 
 ```sh
 chmod +x scripts/create-multiple-postgres-databases.sh
 ```
+
+#### Database backup & restore:
+
+Backup:
+
+```sh
+docker exec -t <postgres-container-id> pg_dumpall -c -U <user> > dump_`date +%d-%m-%Y"_"%H_%M_%S`.sql
+```
+
+Restore:
+
+```sh
+cat <dump_name>.sql | docker exec -i <postgres-container-id> psql -U <user>
+```