When is a backup recommended? (Select two.)
A.
prior to shutting down the cluster
B.
prior to upgrading Vertica
C.
prior to starting the Vertica cluster
D.
any time large amounts of data have been added, updated, or deleted
E.
any time data is added, updated, or deleted
Explanation:
Upgrade release note normally also mention, that you should run a backup prior to the upgrade itself.
So I think it should be A,B and E
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