NebulaGraph database: What is the appropriate setting for replica_factor?

Can I set replica_factor as any number in CREATE SPACE statements?
Is it better to set this parameter higher the more machines we use for storage?

The NebulaGraph documentation describes this parameter as follows:
Specifies the number of replicas in the cluster. The suggested number is 3 in a production environment and 1 in a test environment. The replica number must be an odd number for the need of quorum-based voting. The default value is 1.

But I don’t understand why.

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