Here is the backup and restore database with PostgreSQL database

postgresql_backup_restore.md

References

• https://www.postgresqltutorial.com/postgresql-backup-database/
• https://www.postgresqltutorial.com/postgresql-restore-database/
• https://stackoverflow.com/questions/6842393/import-sql-dump-into-postgresql-database

Remove PostgreSQL packages

• https://askubuntu.com/questions/371722/cant-uninstall-postgresql-package-due-failing-to-start-service
• https://kb.objectrocket.com/postgresql/how-to-completely-uninstall-postgresql-757
• https://dba.stackexchange.com/questions/290639/how-do-i-recover-data-from-the-postgres-data-directory-on-my-hard-drive
• https://stackoverflow.com/questions/2748607/how-to-thoroughly-purge-and-reinstall-postgresql-on-ubuntu