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What is the BEST backup method in this scenario?

You are going to upgrade from R77 to R80. Before the upgrade, you want to back up the system so that, if there are any problems, you can easily restore to the old version with all configuration and management files intact.

What is the BEST backup method in this scenario?
A . backup
B . Database Revision
C . snapshot
D . migrate export

Answer: C

Explanation:

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