Discussion
Consider the following statements about virtual machine snapshots.
1. They allow a rollback to a known state.
2. Long lived snapshots degrade performance.
3. They serve perfectly well as a backup mechanism.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: a snapshot allows rollback, and a long-lived one degrades performance because every write must be redirected into a growing delta file that is also read on every access. Statement 3 is a dangerous belief - a snapshot depends on the original disk and lives on the same storage, so it protects against a bad upgrade and against nothing else. It is not a backup.
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