September 2012
Intermediate to advanced
1680 pages
88h 3m
English
It is critical that a migration does not cause more harm than good to an environment. Subsequently, we cannot stress enough that a good backup system is essential for quick recovery in the event of upgrade failure. Often, especially with the in-place upgrade scenario, a full system backup might be the only way to recover; consequently, it is very important to detail fallback steps in the event of problems. The backup should include the boot and system partitions as well as the system state.
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