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Module 4 topic 2 - Module 4 Topic 2 page 1/5 Module 4 Topic...

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Module 4, Topic 2 page 1/5 Module 4, Topic 2 - Backup and Recovery. Return to List of Topics. Topics. Reading The need for backups A suggested policy for making backups The need for special backups What to backup? Where to store backups? Security Self Assessment Exercises Reading Chapter 11 of Systems Administration. The need for backups What is the point of having backups of a system? 1. Ability to recover from a system crash. 2. Ability to recover deleted or lost files from old records. 3. Provide an archive of files so that they can be removed from the active directories. 4. Provide a "safety net" if new installations do not work, and it becomes necessary to revert to a previous situation. Ability to recover from a system crash. Crashes - such as disk head crashes, corruption of OS files - should be comparatively rare in modern systems. However, unexpected power outages and similar external events can scramble system files, and others, necessitating the restoration of some or all of the file system. Ability to recover deleted or lost files from old records. Users will sometimes, deliberately or inadvertently, remove files which are then needed at some later date. Such files will have to be located on archived backups, and restored.
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Module 4, Topic 2 page 2/5 Provide an archive of files so that they can be removed from the active directories. System managers may adopt a practice of encouraging users to free up disk space by removing files which are non-current, or non-active, on the understanding that they can be readily restored from archives at some time in the future if the need arises. Provide a "safety net" if new installations do not work, and it becomes necessary to revert to a previous situation. Occasionally, the installation of new software becomes so messy or irreparable, that the best course of action is to restore the system to its original condition, and start again. A suggested policy for making backups. 1. Regular or routine procedures. 1.1 Some considerations about when to backup. Most modern operating systems allow for time dependent running of programs. Generally speaking, it is better if backups are performed in the middle of the night when the file
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