The setting defreps (scsp.defaultReplicas), is now policy.replicas min max default (see Replaced Settings).
This default setting is how many replicas you want for each content object (not a context, or bucket/domain), provided that no overriding lifepoint is present on the object and that default > min.
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If min = 2 and default = 4, an object written with lifepoint reps=3 in the lifepoint will have 3 replicas.
See Lifepoint Metadata Headers and Implementing Replication Policy.