When you are running a Replication/ Failover service within the DSS, then you can have identical server( system ), that means your first server and second server will be exact the same, and when the first server is down, the second one will run immediately with the same data on it, also you can enable the snapshots and replicate them so you can still have them on the second server too.
What are you looking for about the more information about snap shooting and else? If you are looking for general information, you may Google it or check the Wikipedia for example. Unless if you are looking for something specific for example.
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