4.1 Perform regular backup
An old joke has it that everyone always had plans to do a full backup the very day a system crashed; it just crashed a bit too early. As sad a fact as it may be, every system has the potential to crash; therefore, you should perform backups regularly on all your systems.
One could argue that the importance of backups has diminished over the years as other technologies such as RAID have been added to the server. RAID is a wonderful technology that allows the server to continue operating even in the event of a hard drive failure. What RAID cannot do, however, is enable you to bring up another system to continue operations after a tornado completely destroys the server. Likewise, RAID is of little ...