updated back backup and restore

documentation/backup-and-restore.md

@@ -22,6 +22,23 @@ b. Get the list of Golden Record Source Ids \
 c. Get the list of interactions \
 d. Write the data to file (JSON)
 
+## Prerequisites
+- PostgreSQL Version: Ensure that PostgreSQL 15.5.0 is installed. 
+- The backup and restore operations are validated on this version.
+Verify the installation by running psql --version
+
+**Python Installation**
+- Make sure Python and the python-dotenv package are installed to manage environment variables.
+- Verify the installation by running python3 -m dotenv --version
+
+**Using python-dotenv**
+ Load these variables using python-dotenv:
+- from dotenv import load_dotenv
+- import os
+- load_dotenv(/path/to/your/.env)
+- print(os.getenv(environment variable name))
+- python3 test_dotenv.py (This should load the environment variables from your .env.local file)
+
 ## Backup Dgraph and Postgres Process
 - **Backup Directory Dgraph:** \
 JeMPI/devops/linux/docker/docker_data/data/backups/dgraph
@@ -44,6 +61,14 @@ The backup process creates a folder with a timestamp. Inside this folder, backup
 
 ![Backup Postgres and Dgraph](../.gitbook/assets/14)
 
+**Manual Backup Process**
+
+- pg_dump -U <username> -d <database_name> > /path/to/backup_file.sql
+
+**Verify if process was successful**
+- echo $? (This variable holds the exit status of the last command executed. An exit status of 0 indicates that the last command (pg_dump) completed successfully.)
+- ls -lh 
+
 ## Restore Dgraph and Postgres Process
 
 - **Backup Directory:** JeMPI/devops/linux/docker/docker_data/data/backups/dgraph