Just don't use couchbase for larger amounts of data. In fact as a database it is mediocre at best. NoSQL, when it even works, is slow. Bulk operations are slow. Memcache backend gets constantly killed by oom killer. Rebalancing cluster is manual. Indices dont work. Timeouts are specified in microseconds. Documentation is lacking. maybe that's changed since 5.3, but bad taste lingers on.
Try RavenDB, also multi master replication and has all the store mentioned capabilities
There isn't a 5.3 of Couchbase Server...
My bad, memories fade. It was 5.1.3 then, i think. I remember upgrading the cluster to 5.5 with some pain and fear of data loss, however the concrete version i was upgrading from eludes me.