Linux

Overview This project documents the design and implementation of a production-grade backup system for a Linux workstation, replicating critical system directories to a Synology NAS. The objectives were: Fully automated operation Safe execution from both CLI and scheduler No overlapping runs Protection against hung transfers Reliable email reporting Support for machines that are not always powered on All hostnames, IP addresses, and email domains below are intentionally anonymised. Architecture Source: Linux workstation Destination: Synology NAS (SSH, non-standard port) Transport: rsync over SSH (key-based authentication) Scheduler: anacron Reporting: msmtp (sendmail-compatible) ...

Overview This article documents a practical pattern for reliable outbound mail in a small network: A dedicated mail relay host (hl-mail) running Postfix Workstations using msmtp (via msmtp-mta) as a lightweight sendmail-compatible client Postfix relays mail to an upstream provider (a “smart host”) using SASL authentication and (typically) STARTTLS All hostnames, IP addresses, and email addresses are anonymised. Replace placeholders like: hl-mail.lan (mail relay host) mail.example.com (upstream SMTP provider / smart host) user@example.com (mailbox) 192.168.x.x (LAN IPs) Architecture Workstation(s) sendmail → msmtp → SMTP to hl-mail.lan:25 ...