A system administrator is about to perform a major software upgrade on a critical virtual server. The administrator needs a way to quickly revert the server to its exact pre-upgrade state if any issues arise. Which of the following backup methods would be the MOST efficient for this purpose?
A snapshot is the most efficient method because it captures the entire state of a virtual machine at a specific point in time and is designed for rapid reversion. A full backup would work but restoring it would be significantly slower. Differential backups are also slower to restore as they require the last full backup as well. Replication to a warm site is a disaster recovery strategy for site-level failures, not for reverting a single server's configuration change.
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What is a virtual machine snapshot, and how does it work?
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How is a snapshot different from a full backup?
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What is replication to a warm site, and when is it used?