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Proper use of preventive maintenance procedures can keep the system in top operat- ing condition and minimize the need for costly, time-consuming service procedures. This appendix contains maintenance procedures that you should perform regularly.

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Everyone inadvertently deletes files at one time or another. Also, hard-disk drives can fail after extended use, so it is not a question of whether you will eventually lose data, but when. To avoid such loss of data, you should regularly make backup copies of all hard-disk drive files. Frequent, regular backups are a must for anyone using a hard- disk drive.

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The frequency with which backups should be made depends on the amount of stor- age space on a hard-disk drive and the volatility of the data contained on the drive. Heavily used systems require more frequent backups than systems in which files are seldom changed.

Dell recommends that you back up the hard-disk drive at least once a week, with a daily backup of those files known to have been changed. Following these guidelines ensures the loss of no more than a day’s work in the event of a hard-disk drive failure or if you inadvertently delete one or more important files.

As further insurance against data losses, you should keep duplicate copies of the weekly and monthly backups at an off-site location. Doing this ensures that you lose no more than a week’s work, even if one of the on-site backups becomes corrupted.

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Iomega Zip drives are fast, convenient, and reliable devices that can back up data at rates of up to 11.2 megabytes per second (MB/sec) (sustained, without data compres- sion) and can often run unattended. Dell offers Zip drives with storage capacities of 100 megabytes per Zip disk and recommends these drives and their associated backup software for use as system backup devices.

Maintaining the System D-1