Useful article on how to backup and restore MySQL databases. Includes example commands and a basic overview of the theory.
Keychain is a front end for ssh-agent which sets up one ssh-agent session per machine reboot. Useful for unattended backups, and so on, as the key passwords need only be provided once per reboot.
An out of date guide on how to setup scponly and a chrooted scponly. It includes info on a bug (dev/null) which is now fixed, but otherwise it generally applies.
A howto on setting up monit on an Ubuntu server. Fairly simple and straightforward. Includes basic info on customising alerts and so on.
rsnapshot is a perl utility that creates (illusory) filesystem snapshots using rsync and hardlinks (to save space). Every time a file is changed, a new copy is created, otherwise a hard link is used. It works hourly, daily or monthly.
A script to set up and deploy django servers. Hat tip rob.