Home Assistant is an entirely open source tool for home automation of both residential and business environments.

Technology | Home Assistant | Home Automation

In PostgreSQL, it is possible to create database links and connect two separate databases, whether they reside on the same server or on separate servers, as long as they are accessible over a network.

Solutions | Technology | Server | Database | PostgreSQL

MariaDB (and MySQL) allow master-slave replication to be configured between two servers. A master-master type of replication can be implemented via Galera, but it requires at least 3 servers. If you have 2 servers, you can configure master-master replication by by cross-duplicating the master-slave replication.

Solutions | Technology | Server | Database | Firewall | MariaDB | OpenSSL | UFW

Client : several ones Synology installation and configuration : users, sharing privileges and backup MS Windows clients configuration

Solutions | Technology | Projects | NAS | File Server