A step-by-step guide to building an automated Linux backup system using rsync and systemd. Covers writing a bash script with incremental backups (retaining previous file versions via --backup-dir), setting up a systemd service and timer to run backups automatically at midnight, adding a mount point safety check to prevent false-positive successes when an NFS share is unavailable, and integrating healthchecks.io to receive alerts if the backup silently fails.
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