The ten commandments of system administration:

I. Thou shalt make regular and complete backups
II. Thou shalt establish absolute trust in thy servers
III. Thou shalt be the first to know when something goes down
IV. Thou shalt keep server logs on everything
V. Thou shalt document complete and effective policies and procedures
VI. Thou shalt know what cable goes where
VII. Thou shalt use encryption for insecure services
VIII. Thou shalt not lose system logs when a server dies
IX. Thou shalt know the openings into your servers
X. Thou shalt not waste time doing repetitive and mundane tasks