@Dilipkumar
I am not sure what you mean by backups. Backups of what?
The NiFi-Registry is used to version control Process Groups from one or more NiFi instances. Those version controlled flow definitions include all configurations (minus any sensitive properties values). A version controlled flow definition can be imported to any NiFi instance or cluster that has authorized access to the NiFi-Registry bucket in which the it is stored. NiFi-Registry can be configured to persist the flow definition storage in a local file persistence or in a git repository.
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Thank you,
Matt