Hey
The MultiSite Clusters have *site replication factor and site search factors *. With that in mind, you can always control how many copies you will have of the data generated in each site with the origin parameter. Furthermore, you can specify how many copies each site has:
site_replication_factor = origin:2, site1:1, site2:1, site3:1, site4:3, site5:1,site6:1 total:9
Imagine your site1 has a new bucket b1, than site1 will have 2 copies of b1, and site2,3,5,6 will have 1 copy and site4 will have 3 copies. This gives a total of 9 copies of a single bucket.
In this particular example, the replication factor explicitly specifies all sites, but that is not a requirement. A non-explicit site is a site that the replication factor does not explicitly specify, and so it may not have bucket copies for all buckets in it, which would be a good scenario for a smaller data center.
So no, you can control that and your smaller site doesn't need to have everything of the larger site.
For full detailed info on this: https://docs.splunk.com/Documentation/Splunk/7.0.2/Indexer/Multisitearchitecture
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